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* ''VisualNovel/TheGreatAceAttorney'': In the final case, Sholmes exploits this to circumvent the main villain using a closed trial (basically, no jury to notice him doing blatantly illegal things) to attempt to cover up his involvement with the Professor and Reaper murders; no one who isn't involved in the trial is allowed to see it, but all trials are conducted under the auspices of the Crown, [[spoiler:so showing the trial to Queen Victoria is perfectly fine, as she's considered to be involved by default. And Her Majesty is '''not happy''' with her own Lord Chief Justice trying to subvert the legal system to his own ends]].
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*** The students are forbidden from sleeping anywhere but the dorm rooms. However, the rule does not specify that students have to sleep in their assigned room, nor are they forbidden from sharing a room with another student. Also, it only covers deliberately sleeping, being knocked unconscious is not counted as a violation of the rule.
*** There is a rule that says a participant may not kill more than two people, to prevent the obvious problem of some stab-happy participant killing everyone else and leaving no one to convict them in a trial. But while the ''participants'' can't kill more than two people, but ''Monokuma'' can, so one student manipulates a crime scene in order to get the students to vote for the wrong culprit, meaning that Monokuma will kill everyone except the murderer. And yes, this does mean that the responsible student (who isn't the killer) will die too, but due to circumstances they don't care.[[spoiler: Aoi Asahina held every remaining student, herself included, responsible for Sakura's death, and framed herself for Sakura's suicide so Monokuma would kill them all.]]
*** There is a rule that says a participant may not kill more than two people, to prevent the obvious problem of some stab-happy participant killing everyone else and leaving no one to convict them in a trial. But while the ''participants'' can't kill more than two people, but ''Monokuma'' can, so one student manipulates a crime scene in order to get the students to vote for the wrong culprit, meaning that Monokuma will kill everyone except the murderer. And yes, this does mean that the responsible student (who isn't the killer) will die too, but due to circumstances they don't care.[[spoiler: Aoi Asahina held every remaining student, herself included, responsible for Sakura's death, and framed herself for Sakura's suicide so Monokuma would kill them all.]]
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*** The students are forbidden from sleeping anywhere but the dorm rooms. However, the rule does not specify that students have to sleep in their assigned room, room (hence Sayaka and Makoto's room exchange), nor are they forbidden from sharing a room with another student. student (Aoi and Sakura had a sleepover in the same chapter). Also, it only covers deliberately sleeping, being knocked unconscious is not counted as a violation of the rule.
rule- which is a good thing for Toko, since she tends to faint when she sees blood.
*** The rules of the killing game make having an accomplice unlikely; only the person who actually does the deed is the Blackened and is eligible to leave, so an accomplice would die along with the rest at the end of the class trial. They are ''not'', however, forbidden, so if you can convince someone to be your accomplice ''in spite'' of them knowing the above, you're both free. [[spoiler: Celestia gets Hifumi to be her accomplice by telling him that they'd take advantage of]] another loophole: there's nothing saying that there can't be ''two'' killers who each act as ''each other's'' accomplice. If this happens, then there will be no reason to betray their partner at the class trial, since they'll both escape if all goes well and their partner can also betray ''them''.[[spoiler: Of course, it's a moot point in this case since Celestia always intended to kill Hifumi [[YouHaveOutlivedYourUsefulness when he'd played his part]] instead of killing someone else like she told him.]]
*** There is a rule that says a participant may not kill more than two people, to prevent the obvious problem of somestab-happy kill-happy participant killing everyone else and leaving no one to convict them in a trial. But while the ''participants'' can't kill more than two people, but ''Monokuma'' can, so one student manipulates a crime scene in order to get the students to vote for the wrong culprit, meaning that Monokuma will kill everyone except the murderer. And yes, this does mean that the responsible student (who isn't the killer) will die too, but due to circumstances they don't care.[[spoiler: Aoi Asahina held every remaining student, herself included, responsible for Sakura's death, and framed herself for Sakura's suicide so Monokuma would kill them all.]]
*** The rules of the killing game make having an accomplice unlikely; only the person who actually does the deed is the Blackened and is eligible to leave, so an accomplice would die along with the rest at the end of the class trial. They are ''not'', however, forbidden, so if you can convince someone to be your accomplice ''in spite'' of them knowing the above, you're both free. [[spoiler: Celestia gets Hifumi to be her accomplice by telling him that they'd take advantage of]] another loophole: there's nothing saying that there can't be ''two'' killers who each act as ''each other's'' accomplice. If this happens, then there will be no reason to betray their partner at the class trial, since they'll both escape if all goes well and their partner can also betray ''them''.[[spoiler: Of course, it's a moot point in this case since Celestia always intended to kill Hifumi [[YouHaveOutlivedYourUsefulness when he'd played his part]] instead of killing someone else like she told him.]]
*** There is a rule that says a participant may not kill more than two people, to prevent the obvious problem of some
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** Chapter 5 revolves around exploitation of the same two-person limit loophole that happened in chapter 4 of [=THH=] (student's can't kill more than 2 people, but Monokuma can kill more if they break the rules or vote wrong), though in this case the one responsible wanted ''someone else'' to escape and all the other students, themself included, to die.[[spoiler: After learning that everyone in class was a Remnant of Despair, Nagito crossed the DespairEventHorizon himself and decided to kill them all. However, there was a mole planted by the Future Foundation who was innocent (Chiaki), so he decided to rig it so that a)Chiaki killed him, and b)nobody, including Chiaki herself, could know that she did it.]]
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* ''VisualNovel/TheGreatAceAttorney'': In the final case, Sholmes exploits this to circumvent the main villain using a closed trial (basically, no jury to notice him doing blatantly illegal things) to attempt to cover up his involvement with the Professor and Reaper murders; no one who isn't involved in the trial is allowed to see it, but all trials are conducted under the auspices of the Crown, [[spoiler:so showing the trial to Queen Victoria is perfectly fine, as she's considered to be involved by default. And Her Majesty is '''not happy''' with her own Lord Chief Justice trying to subvert the legal system to his own ends]].
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*** There is a rule that says a participant may not kill more than two people. More than once has someone tried to bypass this using the exact same loophole: specifically, ''participants'' may not kill more than two people, but ''Monokuma'' can, and the person in question deliberately sets things up so that the students accuse the wrong person at the class trial, getting ''everyone'' but the murderer killed, thus killing more than two people. Yes, this means the one who tries to pull this dies too, but circumstances tend to mean they don't care.
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*** There is a rule that says a participant may not kill more than two people. More than once has someone tried people, to bypass this using prevent the exact same loophole: specifically, obvious problem of some stab-happy participant killing everyone else and leaving no one to convict them in a trial. But while the ''participants'' may not can't kill more than two people, but ''Monokuma'' can, and the person so one student manipulates a crime scene in question deliberately sets things up so that order to get the students accuse to vote for the wrong person at culprit, meaning that Monokuma will kill everyone except the class trial, getting ''everyone'' but the murderer killed, thus killing more than two people. Yes, murderer. And yes, this means does mean that the one who tries to pull this dies responsible student (who isn't the killer) will die too, but due to circumstances tend to mean they don't care.[[spoiler: Aoi Asahina held every remaining student, herself included, responsible for Sakura's death, and framed herself for Sakura's suicide so Monokuma would kill them all.]]
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*** Fighting against Monokuma will be punished by him attempting to kill the culprit. [[spoiler:However, there's nothing stopping you from TakingTheBullet in the culprit's stead; since you technically didn't break any rule, Monokuma will be forced to save your life.]]
*** The entire premise of that game can revolve around this. [[spoiler:Once Monokuma took the role as the teacher for the Neo World Program, Monokuma needed to find loopholes in order for his plan into reviving Junko Enoshima to work as the role of the teacher can not kill a student unless they break the rules. Because of that, he ended up creating the killing school trip as if a student committed murder, they would have broke the rule against violence at the island thus Monokuma has the right to execute the killer if they kill somebody.]]
*** The entire premise of that game can revolve around this. [[spoiler:Once Monokuma took the role as the teacher for the Neo World Program, Monokuma needed to find loopholes in order for his plan into reviving Junko Enoshima to work as the role of the teacher can not kill a student unless they break the rules. Because of that, he ended up creating the killing school trip as if a student committed murder, they would have broke the rule against violence at the island thus Monokuma has the right to execute the killer if they kill somebody.]]
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*** Fighting against Monokuma will be punished by him attempting to kill the culprit. [[spoiler:However, there's nothing stopping you from TakingTheBullet in the culprit's stead; since you technically ''you'' didn't attack Monokuma and thus didn't break any the rule, Monokuma will be forced have to save your life.]]
*** The entire premise of that game can revolve around this. [[spoiler:Once Monokuma took the role as the teacher for the Neo World Program, Monokuma needed to find loopholes in order for his plan into reviving Junko Enoshima to work as the role of the teachercan not kill can't interfere with a student unless they break the rules. Because of that, rules, and he ended up creating the killing school trip as if can't remove any rules, though he can add new ones. So he deliberately creates a student committed murder, they would have broke rule (the obligatory 'kill someone to leave' rule) that encourages people to break the rule against violence at violence, which would allow him to kill the island thus Monokuma has perpetrator, and adds a rule against voting wrong in class trials so he could kill the right to execute the killer others if they kill somebody.didn't find the killer.]]
*** The entire premise of that game can revolve around this. [[spoiler:Once Monokuma took the role as the teacher for the Neo World Program, Monokuma needed to find loopholes in order for his plan into reviving Junko Enoshima to work as the role of the teacher
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** Chapter 5 revolves around exploitation of the same two-person limit loophole that happened in chapter 4 of [=THH=] (student's can't kill more than 2 people, but Monokuma can kill more if they break the rules or vote wrong), though in this case the one responsible wanted ''someone else'' to escape and all the other students, themself included, to die.[[spoiler: After learning that everyone in class was a Remnant of Despair, Nagito crossed the DespairEventHorizon himself and decided to kill them all. However, there was a mole planted by the Future Foundation who was innocent (Chiaki), so he decided to rig it so that a)Chiaki killed him, and b)nobody, including Chiaki herself, could know that she did it.]]
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*** On a related subject, the Berserker class is ''supposed'' to [[WithGreatPowerComesGreatInsanity trade its sanity in exchange for raw power]]; [[NecessaryDrawback the sanity reduction]] [[SanityHasAdvantages does hinder the Servant's fighting ability]], but the power increase is supposed to make up for this and [[PowerAtAPrice make the trade-off a net positive]]. However, there Ain't No Rule that says you don't get the power if your Servant has a skill which effectively renders the sanity loss moot (for instance, the ''LightNovel/FateZero'' Berserker has a skill called Eternal Arms Mastership, meaning his fighting abilities aren't affected by mental hindrances... like the sanity loss caused by his class), allowing for the Servant’s fighting ability to fully benefit from the power increase without being impacted by the sanity reduction.
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*** On a related subject, the Berserker class is ''supposed'' to [[WithGreatPowerComesGreatInsanity trade its sanity in exchange for raw power]]; [[NecessaryDrawback the sanity reduction]] [[SanityHasAdvantages does hinder the Servant's fighting ability]], but the power increase is supposed to make up for this and [[PowerAtAPrice make the trade-off a net positive]]. However, there Ain't No Rule that says you don't get the power if your Servant has a skill which effectively renders the sanity loss moot (for instance, the ''LightNovel/FateZero'' ''Literature/FateZero'' Berserker has a skill called Eternal Arms Mastership, meaning his fighting abilities aren't affected by mental hindrances... like the sanity loss caused by his class), allowing for the Servant’s fighting ability to fully benefit from the power increase without being impacted by the sanity reduction.
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** One example not related to the Grail War rules: in ''LightNovel/FateZero'', Kiritsugu puts himself under a geas that he will not harm Kayneth, provided that Kayneth gives up on the Grail and kills his Servant. Kayneth agrees and does so... and is immediately shot dead by Kiritsugu's ally. After all, Kiritsugu himself did not harm Kayneth.
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** One example not related to the Grail War rules: in ''LightNovel/FateZero'', ''Literature/FateZero'', Kiritsugu puts himself under a geas that he will not harm Kayneth, provided that Kayneth gives up on the Grail and kills his Servant. Kayneth agrees and does so... and is immediately shot dead by Kiritsugu's ally. After all, Kiritsugu himself did not harm Kayneth.
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Anything involving magic is disqualified from being a Surprisingly Realistic Outcome
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** At WizardingSchool Iris Academy, class exams take place in dungeons, and generally the only rule is "find the exit". In one exam, an illusion is hiding the exit, and the student is expected to use magic to break the illusion. However, [[AwesomenessByAnalysis Ellen is smart enough to just deduce where the exit is on her own]] without even needing to use magic. She passes the exam, but [[SurprisinglyRealisticOutcome her professor basically equates what she did to cheating, since the exam was meant to test one's magical ability.]]
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** At WizardingSchool Iris Academy, class exams take place in dungeons, and generally the only rule is "find the exit". In one exam, an illusion is hiding the exit, and the student is expected to use magic to break the illusion. However, [[AwesomenessByAnalysis Ellen is smart enough to just deduce where the exit is on her own]] without even needing to use magic. She passes the exam, but [[SurprisinglyRealisticOutcome her professor basically equates what she did to cheating, since the exam was meant to test one's magical ability.]]
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*** You can't break down locked doors. Later in the game, though, [[spoiler:the students break down a door into a sealed room, because it was ''barred'', not locked.]]
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*** You can't break No picking locks or breaking down locked doors. Later in the game, though, [[spoiler:the students break down a door into a sealed room, room without punishment, because it was ''barred'', not locked.]]
*** There is a [[TheMole mole]] among the students working for Monokuma, albeit unwillingly, as Monokuma has a hostage. One of their orders is to kill someone if there hasn't been a murder in a while to keep things from getting too boring. [[spoiler:Nothing saying it has to be someone ''else'', thus Sakura commits suicide to both fulfill her end of the deal and atone for betraying everyone's trust as the mole, leaving behind a suicide note urging the other students to band together and fight Monokuma. Before doing so, she also breaks down the locked door to the headmaster's office, thus allowing the other students to enter it and investigate without breaking the above rule]].
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*** The game has the same basic premise, but a slightly different ruleset, so many of these loopholes no longer apply, and some new ones are created. For example, there is a rule saying that you may not enter the gym or the pool after nighttime... but no rules say that [[spoiler:you cannot enter the pool ''area'' after nighttime... or that ''corpses'' cannot enter the gym at nighttime.]]
*** There is a big change to the "two murder limit" rule. There is no limit to the number of people you are allowed to kill. Also, the killing game ends when there are only two people left. The loophole these two rules create does not go unnoticed - kill everyone but two people (ideally yourself and someone else), and the game ends with no class trial or execution.
*** There is a big change to the "two murder limit" rule. There is no limit to the number of people you are allowed to kill. Also, the killing game ends when there are only two people left. The loophole these two rules create does not go unnoticed - kill everyone but two people (ideally yourself and someone else), and the game ends with no class trial or execution.
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*** The game has the same basic premise, but a slightly different ruleset, so many of these loopholes no longer apply, and some new ones are created. For example, there is a rule saying that you may not enter the gym or the pool after nighttime... but no rules say that [[spoiler:you cannot enter nighttime. However, [[spoiler:that rule only applies to the actual pool itself, not the room with the pool ''area'' after nighttime... or that ''corpses'' cannot enter in it. Also, only ''living'' people have to follow the gym at nighttime.rules. Corpses don't.]]
*** There is a big change to the "two murder limit" rule. There is no limit to the number of people you are allowed to kill. Also, the killing game ends when there are only two people left. The loophole these two rules create does not gounnoticed - unnoticed: just kill everyone but two people (ideally except yourself and someone else), else, and the game immediately ends with no class trial or execution.
*** There is a big change to the "two murder limit" rule. There is no limit to the number of people you are allowed to kill. Also, the killing game ends when there are only two people left. The loophole these two rules create does not go
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* In ''VisualNovel/HigurashiWhenTheyCry'''s backstory, citizens of Hinamizawa [[BigDamPlot protested the construction of a dam that would flood their town]] by, among other things, [[LoudOfWar chanting Buddhist sutras at an extremely high volume outside the construction site]] so their protest would qualify as a religious service, and therefore protected speech, and the police would be forbidden from doing anything to stop them.
* ''VisualNovel/MagicalDiary'':
** At WizardingSchool Iris Academy, class exams take place in dungeons, and generally the only rule is "find the exit". In one exam, an illusion is hiding the exit, and the student is expected to use magic to break the illusion. However, [[AwesomenessByAnalysis Ellen is smart enough to just deduce where the exit is on her own]] without even needing to use magic. She passes the exam, but [[SurprisinglyRealisticOutcome her professor basically equates what she did to cheating, since the exam was meant to test one's magical ability.]]
** The player can do something similar in a different exam; the key to the exit is locked in an exploding chest, but if your Strong is high enough, you can survive the damage you take from the explosion and proceed to pocket the key. Just like the above example, your professor isn't very happy with you if you do this.
** The sworn vow of a witch or wizard is absolutely binding, and due to this, two characters accidentally find themselves in a MagicallyBindingContract when they make a ChildhoodMarriagePromise. They're horrified to learn that they have to marry each other once they turn eighteen, or else they'll both die. Eventually, a loophole in this is found: [[spoiler: the characters promised that they would ''marry'', not that they would marry ''each other''. The player character can offer to marry her instead to fulfill the requirement on her end.]]
* ''VisualNovel/MagicalDiary'':
** At WizardingSchool Iris Academy, class exams take place in dungeons, and generally the only rule is "find the exit". In one exam, an illusion is hiding the exit, and the student is expected to use magic to break the illusion. However, [[AwesomenessByAnalysis Ellen is smart enough to just deduce where the exit is on her own]] without even needing to use magic. She passes the exam, but [[SurprisinglyRealisticOutcome her professor basically equates what she did to cheating, since the exam was meant to test one's magical ability.]]
** The player can do something similar in a different exam; the key to the exit is locked in an exploding chest, but if your Strong is high enough, you can survive the damage you take from the explosion and proceed to pocket the key. Just like the above example, your professor isn't very happy with you if you do this.
** The sworn vow of a witch or wizard is absolutely binding, and due to this, two characters accidentally find themselves in a MagicallyBindingContract when they make a ChildhoodMarriagePromise. They're horrified to learn that they have to marry each other once they turn eighteen, or else they'll both die. Eventually, a loophole in this is found: [[spoiler: the characters promised that they would ''marry'', not that they would marry ''each other''. The player character can offer to marry her instead to fulfill the requirement on her end.]]
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LoopholeAbuse in VisualNovels.
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* ''Franchise/{{Danganronpa}}'' is full of these: Monokuma is happy to admit that he deliberately introduces rules including exploitable loopholes, partly because [[spoiler:he uses those loopholes himself]]. Some of these include:
** ''VisualNovel/DanganronpaTriggerHappyHavoc'':
*** Monokuma introduces a ban on students lending their ID cards to each other. Ain't no rule that [[spoiler:you can't ''borrow'' or ''steal'' an ID card]]; and, in fact, Monokuma [[spoiler:leaves the dead students' ID cards in a publicly accessible box in the school lobby where anyone can pick them up.]]
*** You can't break down locked doors. Later in the game, though, [[spoiler:the students break down a door into a sealed room, because it was ''barred'', not locked.]]
*** Any student who kills another and then is discovered at the trial faces execution, but [[spoiler:ain't no rule that they actually have to ''die''.]] Towards the end of the game, [[spoiler:Alter Ego and Kyoko Kirigiri manage to disrupt Naegi's execution and bring him back into the school]], causing [[spoiler:Monokuma, who can't break the rules to execute Naegi again, to fly into a rage and allow a "final trial", which sets up the ending of the game.]]
*** The students are forbidden from sleeping anywhere but the dorm rooms. However, the rule does not specify that students have to sleep in their assigned room, nor are they forbidden from sharing a room with another student. Also, it only covers deliberately sleeping, being knocked unconscious is not counted as a violation of the rule.
*** There is a rule that says a participant may not kill more than two people. More than once has someone tried to bypass this using the exact same loophole: specifically, ''participants'' may not kill more than two people, but ''Monokuma'' can, and the person in question deliberately sets things up so that the students accuse the wrong person at the class trial, getting ''everyone'' but the murderer killed, thus killing more than two people. Yes, this means the one who tries to pull this dies too, but circumstances tend to mean they don't care.
** ''VisualNovel/Danganronpa2GoodbyeDespair'':
*** Monokuma cannot kill a student unless they break a rule. What he ''can'' do is [[spoiler:lock them in an area without any food and refuse to let them out until a murder occurs. Technically it's the ''students''' fault if they starve to death.]]
*** Fighting against Monokuma will be punished by him attempting to kill the culprit. [[spoiler:However, there's nothing stopping you from TakingTheBullet in the culprit's stead; since you technically didn't break any rule, Monokuma will be forced to save your life.]]
*** The entire premise of that game can revolve around this. [[spoiler:Once Monokuma took the role as the teacher for the Neo World Program, Monokuma needed to find loopholes in order for his plan into reviving Junko Enoshima to work as the role of the teacher can not kill a student unless they break the rules. Because of that, he ended up creating the killing school trip as if a student committed murder, they would have broke the rule against violence at the island thus Monokuma has the right to execute the killer if they kill somebody.]]
*** [[spoiler:Nagito ended up threatening to blow up the entire island killing everybody on it (which is actually a bluff, but Hajime doesn't know that yet). Hajime attempts to convince Monokuma to stop him as this is a violation of the rule in which you can't kill more than two people. Monokuma's response is that Nagito hasn't actually broken the rule ''yet'', and therefore has done nothing to deserve punishment. Merely ''intending'' to break a rule is not against the rules. Also, Monokuma knew it was just a bluff anyway.]]
** ''VisualNovel/DanganronpaV3KillingHarmony'':
*** The game has the same basic premise, but a slightly different ruleset, so many of these loopholes no longer apply, and some new ones are created. For example, there is a rule saying that you may not enter the gym or the pool after nighttime... but no rules say that [[spoiler:you cannot enter the pool ''area'' after nighttime... or that ''corpses'' cannot enter the gym at nighttime.]]
*** There is a big change to the "two murder limit" rule. There is no limit to the number of people you are allowed to kill. Also, the killing game ends when there are only two people left. The loophole these two rules create does not go unnoticed - kill everyone but two people (ideally yourself and someone else), and the game ends with no class trial or execution.
* ''VisualNovel/FateStayNight'' is filled with these.
** The Holy Grail War is [[ThereCanBeOnlyOne a fight between Servants]]. Ain't No Rule that you can't kill a Master (who is usually a SquishyWizard) to [[NoOntologicalInertia make their Servant disappear]]. In fact, since not all Servants are suited to direct combat, sometimes it's the ''only'' way to have a chance.
** A Master is given the power to summon one Servant, and if he loses it, he can form a contract with a Servant whose Master was killed. Ain't No Rule that he can't form contracts with multiple Servants at once (though, given the {{mana}} requirements a single Servant has, a mage strong enough to provide for multiple Servants would be rare indeed).
** There does seem to be a rule that one Servant can't summon another, but the Grail's punishment is simply to make it a fake Servant who can still fill the role nicely enough.
** Ain't No Rule that [[spoiler:the supervisor of the war]] can't compete in the war.
** The [[TheBerserker Berserker]] class has probably ''never'' been used for its original purpose (powering up a weak Servant to usable levels), with every known Master opting to make a powerful Servant even more powerful.
*** On a related subject, the Berserker class is ''supposed'' to [[WithGreatPowerComesGreatInsanity trade its sanity in exchange for raw power]]; [[NecessaryDrawback the sanity reduction]] [[SanityHasAdvantages does hinder the Servant's fighting ability]], but the power increase is supposed to make up for this and [[PowerAtAPrice make the trade-off a net positive]]. However, there Ain't No Rule that says you don't get the power if your Servant has a skill which effectively renders the sanity loss moot (for instance, the ''LightNovel/FateZero'' Berserker has a skill called Eternal Arms Mastership, meaning his fighting abilities aren't affected by mental hindrances... like the sanity loss caused by his class), allowing for the Servant’s fighting ability to fully benefit from the power increase without being impacted by the sanity reduction.
** Ain't No Rule that you have to wait until the war begins to summon your Servant.
** [[DeathOrGloryAttack Broken Phantasm]] is a technique that releases all the power in a Servant's legendary weapon at once, destroying it in the process. Ain't No Rule that you can't use it with temporary copies of weapons[[note]]which would have eventually self-destructed or [[BreakableWeapons been worn down from repeated use]] ''anyways'', meaning that the cost of Broken Phantasm is essentially bypassed by consuming a limited-use weapon early[[/note]].
** From the 3rd Holy Grail war in the backstory and ''VisualNovel/FateHollowAtaraxia'': Ain't No Rule that you can't apply your family's "cast spells twice" ability to the ritual that summons Saber. Meanwhile, the summoning of Angra Mainyu as Avenger was an attempt at Ain't No Rule that suffered from EpicFail ''and'' GoneHorriblyRight ([[spoiler:they tried to summon the GodOfEvil and got a random guy whom early humans used as a {{scapegoat}}, who has no powers and only qualifies as a Servant by being the embodiment of humanity's wish for [[MadeOfEvil evil to exist in a form they can see]]; when he died, his spirit entered the Grail... [[OhCrap which grants wishes]]]]).
** One example not related to the Grail War rules: in ''LightNovel/FateZero'', Kiritsugu puts himself under a geas that he will not harm Kayneth, provided that Kayneth gives up on the Grail and kills his Servant. Kayneth agrees and does so... and is immediately shot dead by Kiritsugu's ally. After all, Kiritsugu himself did not harm Kayneth.
** The Grail War is full of loopholes because many of the rules were made by the Mages' Association and Holy Church, but the Grail only follows its own rules. As far as the Grail is concerned, there ain't no rule Masters have to be chosen from members of either of those organizations, or that their Servants have to recognize their rules.
** In the end, really the rules are just flimsy guidelines and a set of things you physically can and can't do, but at the end of the day, all that really matters is that the last man standing can claim the prize (and they might not do even that). For example, it looks like a rule that every entrant is a Master with Command Seals to control and maintain their Servant, but all that's really there is that Command Seals help control a Servant, and Masters are granted them; anything from an unruly Servant, to Masters stealing Seals, to alliances, to unrelated parties jumping in, to even the supposed neutral ground can jump in on the action. Anyone who [[HonorBeforeReason strictly plays by the intended rules]] is [[CombatPragmatist doomed to get taken out by everyone else]].
* In ''VisualNovel/TheGreatAceAttorney'', the final trial is a closed one, meaning the public aren't allowed to see the proceedings. This ''would'' have allowed [[spoiler: Lord Chief Justice Mael Stronghart]] to cover up the results and get away with his crimes, except for a loophole that Herlock Sholmes exploits; yes, people not involved in the trial aren't allowed to see it. [[spoiler: But all trials in England are conducted under the auspices of the Queen, so essentially live-streaming the trial to UsefulNotes/QueenVictoria is fine as it's her laws being broken and as such she's considered involved by default. And Her Majesty is ''not'' happy to see what her Lord Chief Justice has been up to...]]
* In ''VisualNovel/HeartOfTheWoods'', in an unused ending of the game revealed in the artbook, [[spoiler:Morgan]] frees [[spoiler:Madison]] from her obligation to become Fairy Queen [[spoiler:after Geladura's death]] by saying that [[spoiler:Madison]] had promised to find the fairies a queen, not to become queen herself, [[spoiler:then taking Madison's place]].
* ''VisualNovel/MinotaurHotel'': The protagonist's main strategy in the Main route. A SmugSnake asking Asterion to come to the valley? Point out his ExactWords and avoid being forced to do a KickTheDog. Asterion reminding you that you're a master and he's a servant? Tell him that they're only master and servant to the ''hotel'', but that doesn't mean they can't be equals in other terms. The Labyrinth having an absurdly large contract that makes it difficult to modify and makes it easy for masters to exploit the systems for their own selfishness? [[spoiler:Create a contract so that his arm would amputate should he ever send Asterion to the valley just so he can prove to Asterion that he wants to keep him safe.]]
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LoopholeAbuse in VisualNovels.
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* ''Franchise/{{Danganronpa}}'' is full of these: Monokuma is happy to admit that he deliberately introduces rules including exploitable loopholes, partly because [[spoiler:he uses those loopholes himself]]. Some of these include:
** ''VisualNovel/DanganronpaTriggerHappyHavoc'':
*** Monokuma introduces a ban on students lending their ID cards to each other. Ain't no rule that [[spoiler:you can't ''borrow'' or ''steal'' an ID card]]; and, in fact, Monokuma [[spoiler:leaves the dead students' ID cards in a publicly accessible box in the school lobby where anyone can pick them up.]]
*** You can't break down locked doors. Later in the game, though, [[spoiler:the students break down a door into a sealed room, because it was ''barred'', not locked.]]
*** Any student who kills another and then is discovered at the trial faces execution, but [[spoiler:ain't no rule that they actually have to ''die''.]] Towards the end of the game, [[spoiler:Alter Ego and Kyoko Kirigiri manage to disrupt Naegi's execution and bring him back into the school]], causing [[spoiler:Monokuma, who can't break the rules to execute Naegi again, to fly into a rage and allow a "final trial", which sets up the ending of the game.]]
*** The students are forbidden from sleeping anywhere but the dorm rooms. However, the rule does not specify that students have to sleep in their assigned room, nor are they forbidden from sharing a room with another student. Also, it only covers deliberately sleeping, being knocked unconscious is not counted as a violation of the rule.
*** There is a rule that says a participant may not kill more than two people. More than once has someone tried to bypass this using the exact same loophole: specifically, ''participants'' may not kill more than two people, but ''Monokuma'' can, and the person in question deliberately sets things up so that the students accuse the wrong person at the class trial, getting ''everyone'' but the murderer killed, thus killing more than two people. Yes, this means the one who tries to pull this dies too, but circumstances tend to mean they don't care.
** ''VisualNovel/Danganronpa2GoodbyeDespair'':
*** Monokuma cannot kill a student unless they break a rule. What he ''can'' do is [[spoiler:lock them in an area without any food and refuse to let them out until a murder occurs. Technically it's the ''students''' fault if they starve to death.]]
*** Fighting against Monokuma will be punished by him attempting to kill the culprit. [[spoiler:However, there's nothing stopping you from TakingTheBullet in the culprit's stead; since you technically didn't break any rule, Monokuma will be forced to save your life.]]
*** The entire premise of that game can revolve around this. [[spoiler:Once Monokuma took the role as the teacher for the Neo World Program, Monokuma needed to find loopholes in order for his plan into reviving Junko Enoshima to work as the role of the teacher can not kill a student unless they break the rules. Because of that, he ended up creating the killing school trip as if a student committed murder, they would have broke the rule against violence at the island thus Monokuma has the right to execute the killer if they kill somebody.]]
*** [[spoiler:Nagito ended up threatening to blow up the entire island killing everybody on it (which is actually a bluff, but Hajime doesn't know that yet). Hajime attempts to convince Monokuma to stop him as this is a violation of the rule in which you can't kill more than two people. Monokuma's response is that Nagito hasn't actually broken the rule ''yet'', and therefore has done nothing to deserve punishment. Merely ''intending'' to break a rule is not against the rules. Also, Monokuma knew it was just a bluff anyway.]]
** ''VisualNovel/DanganronpaV3KillingHarmony'':
*** The game has the same basic premise, but a slightly different ruleset, so many of these loopholes no longer apply, and some new ones are created. For example, there is a rule saying that you may not enter the gym or the pool after nighttime... but no rules say that [[spoiler:you cannot enter the pool ''area'' after nighttime... or that ''corpses'' cannot enter the gym at nighttime.]]
*** There is a big change to the "two murder limit" rule. There is no limit to the number of people you are allowed to kill. Also, the killing game ends when there are only two people left. The loophole these two rules create does not go unnoticed - kill everyone but two people (ideally yourself and someone else), and the game ends with no class trial or execution.
* ''VisualNovel/FateStayNight'' is filled with these.
** The Holy Grail War is [[ThereCanBeOnlyOne a fight between Servants]]. Ain't No Rule that you can't kill a Master (who is usually a SquishyWizard) to [[NoOntologicalInertia make their Servant disappear]]. In fact, since not all Servants are suited to direct combat, sometimes it's the ''only'' way to have a chance.
** A Master is given the power to summon one Servant, and if he loses it, he can form a contract with a Servant whose Master was killed. Ain't No Rule that he can't form contracts with multiple Servants at once (though, given the {{mana}} requirements a single Servant has, a mage strong enough to provide for multiple Servants would be rare indeed).
** There does seem to be a rule that one Servant can't summon another, but the Grail's punishment is simply to make it a fake Servant who can still fill the role nicely enough.
** Ain't No Rule that [[spoiler:the supervisor of the war]] can't compete in the war.
** The [[TheBerserker Berserker]] class has probably ''never'' been used for its original purpose (powering up a weak Servant to usable levels), with every known Master opting to make a powerful Servant even more powerful.
*** On a related subject, the Berserker class is ''supposed'' to [[WithGreatPowerComesGreatInsanity trade its sanity in exchange for raw power]]; [[NecessaryDrawback the sanity reduction]] [[SanityHasAdvantages does hinder the Servant's fighting ability]], but the power increase is supposed to make up for this and [[PowerAtAPrice make the trade-off a net positive]]. However, there Ain't No Rule that says you don't get the power if your Servant has a skill which effectively renders the sanity loss moot (for instance, the ''LightNovel/FateZero'' Berserker has a skill called Eternal Arms Mastership, meaning his fighting abilities aren't affected by mental hindrances... like the sanity loss caused by his class), allowing for the Servant’s fighting ability to fully benefit from the power increase without being impacted by the sanity reduction.
** Ain't No Rule that you have to wait until the war begins to summon your Servant.
** [[DeathOrGloryAttack Broken Phantasm]] is a technique that releases all the power in a Servant's legendary weapon at once, destroying it in the process. Ain't No Rule that you can't use it with temporary copies of weapons[[note]]which would have eventually self-destructed or [[BreakableWeapons been worn down from repeated use]] ''anyways'', meaning that the cost of Broken Phantasm is essentially bypassed by consuming a limited-use weapon early[[/note]].
** From the 3rd Holy Grail war in the backstory and ''VisualNovel/FateHollowAtaraxia'': Ain't No Rule that you can't apply your family's "cast spells twice" ability to the ritual that summons Saber. Meanwhile, the summoning of Angra Mainyu as Avenger was an attempt at Ain't No Rule that suffered from EpicFail ''and'' GoneHorriblyRight ([[spoiler:they tried to summon the GodOfEvil and got a random guy whom early humans used as a {{scapegoat}}, who has no powers and only qualifies as a Servant by being the embodiment of humanity's wish for [[MadeOfEvil evil to exist in a form they can see]]; when he died, his spirit entered the Grail... [[OhCrap which grants wishes]]]]).
** One example not related to the Grail War rules: in ''LightNovel/FateZero'', Kiritsugu puts himself under a geas that he will not harm Kayneth, provided that Kayneth gives up on the Grail and kills his Servant. Kayneth agrees and does so... and is immediately shot dead by Kiritsugu's ally. After all, Kiritsugu himself did not harm Kayneth.
** The Grail War is full of loopholes because many of the rules were made by the Mages' Association and Holy Church, but the Grail only follows its own rules. As far as the Grail is concerned, there ain't no rule Masters have to be chosen from members of either of those organizations, or that their Servants have to recognize their rules.
** In the end, really the rules are just flimsy guidelines and a set of things you physically can and can't do, but at the end of the day, all that really matters is that the last man standing can claim the prize (and they might not do even that). For example, it looks like a rule that every entrant is a Master with Command Seals to control and maintain their Servant, but all that's really there is that Command Seals help control a Servant, and Masters are granted them; anything from an unruly Servant, to Masters stealing Seals, to alliances, to unrelated parties jumping in, to even the supposed neutral ground can jump in on the action. Anyone who [[HonorBeforeReason strictly plays by the intended rules]] is [[CombatPragmatist doomed to get taken out by everyone else]].
* In ''VisualNovel/TheGreatAceAttorney'', the final trial is a closed one, meaning the public aren't allowed to see the proceedings. This ''would'' have allowed [[spoiler: Lord Chief Justice Mael Stronghart]] to cover up the results and get away with his crimes, except for a loophole that Herlock Sholmes exploits; yes, people not involved in the trial aren't allowed to see it. [[spoiler: But all trials in England are conducted under the auspices of the Queen, so essentially live-streaming the trial to UsefulNotes/QueenVictoria is fine as it's her laws being broken and as such she's considered involved by default. And Her Majesty is ''not'' happy to see what her Lord Chief Justice has been up to...]]
* In ''VisualNovel/HeartOfTheWoods'', in an unused ending of the game revealed in the artbook, [[spoiler:Morgan]] frees [[spoiler:Madison]] from her obligation to become Fairy Queen [[spoiler:after Geladura's death]] by saying that [[spoiler:Madison]] had promised to find the fairies a queen, not to become queen herself, [[spoiler:then taking Madison's place]].
* ''VisualNovel/MinotaurHotel'': The protagonist's main strategy in the Main route. A SmugSnake asking Asterion to come to the valley? Point out his ExactWords and avoid being forced to do a KickTheDog. Asterion reminding you that you're a master and he's a servant? Tell him that they're only master and servant to the ''hotel'', but that doesn't mean they can't be equals in other terms. The Labyrinth having an absurdly large contract that makes it difficult to modify and makes it easy for masters to exploit the systems for their own selfishness? [[spoiler:Create a contract so that his arm would amputate should he ever send Asterion to the valley just so he can prove to Asterion that he wants to keep him safe.]]
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