History GoodBadBugs / FirstPersonShooter

* The iPhone port of ''{{Wolfenstein 3D}}'' has a tendency to slow to a chugging crawl when firing weapons after playing for a length of time. This makes boss battles a lot easier as you can rapidly shoot them faster they can hit you, which makes up for the added difficulty of it being near-impossible to strafe left and right.

* ''KillingFloor'' has a glitch with weapons that can change their fire rate. Firing repeatedly in semi-auto mode and then switching to full-auto can trigger a glitch where the gun will have [[http://www.youtube.com/watch?v=GC5iLNRy4Gw no recoil]].

** In the final level of DOOM II, MAP30:Icon Of Sin, the final boss spawns enemies to do his dirty work. However, if the final boss spawns an arch-vile, and the arch-vile tries to resurrect an enemy who was also a spawned enemy, he is resurrected just outside the level boundaries, completely harmless, due to a bug in the resurrection code. This can make the difficulty of the final level slightly easier than if the enemies actually were resurrected where they could hurt you again.

* ''Tribes 2'' also had a pretty hilarious bug that could get entire teams hooked on trying to trigger it. Not sure if it was ever patched, but it was possible to launch a Mobile Point Base clear off into the horizon. All you had to do was park it and let it latch itself into the ground, hurl concussion grenades at it, have somebody start to drive it and unhook it from the ground, and then it would suddenly fly away suddenly spinning on all 3 axes.

* There is a way to make the Witch harmless in ''Left4Dead 2'' if you have a gas can and a propane tank or grenade launcher. When the Witch is hit by an explosion directly, she stumbles and then freaks out and attacks. However, if she stumbles and gets set on fire at the exact same time, the Witch flails about as she burns to death while not attacking anyone since her AI still thinks it is in stumble mode. This can be a life saver on Expert and Realism.

* In ''HalfLife2'' the player could hold a small flat object underneath themselves and jump repeatedly. Since the object is treated as a platform, and carried objects are held at a set distance, you could use this to hover over sizable parts of the level when done right. This has since been patched in Episode 1 and onwards, but is still a vital part of the "Half-Life 2 Done Quick" speedrun.

* ''TeamFortress2''

* ''KillingFloor'' has a glitch with weapons that can change their fire rate. Firing repeatedly in semi-auto mode and then switching to full-auto can trigger a glitch where the gun will have [[http://www.youtube.com/watch?v=GC5iLNRy4Gw no recoil]].

** At one point in the game you have to drink a genetic concoction that results in your plasmids becoming unstable, causing them to switch randomly. However, the plasmids you switch to include ones you haven't got equipped and ones you haven't even ''bought'', and each plasmid is at maximum level regardless of what level it was before you downed the potion. And to cap it off, each plasmid switch causes your EVE bar to fully recharge.

*** With the release of the Cow Mangler 5000, an EMP gun for the soldier, [[http://www.youtube.com/watch?v=3roqd3rOtPsa new glitch involving using a charged shot and the Director taunt at the same time has emerged]]. It looks a lot like a Kamehameha from DragonBallZ. Many consider it to be the most awesome glitch that the game has ever had.

*** There is also a keypad in the Vandenberg base, one of the ones that you have to use to power up the robots online. Punching in the code will get you 200 skill points. Every single time you use it. For even faster skill points, just hack the keypad with a multitool, and you can gain 200 skill points every time you click the mouse button. If you're a fast clicker like this troper...

* In ''VideoGame/DeusExHumanRevolution'', the combat system allows you to walk up to unsuspecting enemies and either kill them or knock them out with a scripted takedown animation (and later, you can learn a double takedown). Unfortunately, it appears that the game scripters (whether intentionally or not) applied the same takedown animations to ''civilians''. This means that you can walk up to random people and perform hilarious moves, like [[http://www.youtube.com/watch?v=pEWoVsF0MIo&feature=related coldcocking a prostitute in the face while her friends look on]], punching someone so hard that it apparently breaks the sound barrier and [[http://www.youtube.com/watch?v=zYpuzHyEY8Q&feature=related taking down two civilians who've suddenly gained combat skills]].

** At the end of the Vandenberg base mission, speaking to Gary Savage results in a reward: an item and some Tech Points. If your inventory was full, JC says that he can't take the item yet and breaks out of the conversation to allow you to drop something. When you talk to him again, he tries to give you your quest reward: an item and some Tech Points. This can be exploited for infinite Tech Points by talking to him repeatedly and never actually dropping an item. You can also enter the correct code for enabling the bots at Vandenberg Air Force Base as much as you like. Each time will yield the player skill points.
** There is also a keypad in the Vandenberg base, one of the ones that you have to use to power up the robots online. Punching in the code will get you 200 skill points. Every single time you use it. For even faster skill points, just hack the keypad with a multitool, and you can gain 200 skill points every time you click the mouse button. If you're a fast clicker like this troper...

* In ''[[HalfLife Half-Life 2]]'' the player could hold a small flat object underneath themselves and jump repeatedly. Since the object is treated as a platform, and carried objects are held at a set distance, you could use this to hover over sizable parts of the level when done right. This has since been patched in Episode 1 and onwards, but is still a vital part of the "Half-Life 2 Done Quick" speedrun.

** ''HalfLife 2'''s [=SMOD=] added tons of (hilarious) new weapons, more enemies to kill with said weapons, and a mighty melee attack for Gordon Freeman. When the FreelanceAstronauts played the airboat levels with it, they discovered that you could use your melee attack while sailing. Which proceeds to bump the boat forward faster. Which could be spammed to boost the boat in any direction. And so began [[http://freelanceastronauts.com/view.php?id=538 the Kickboat Saga]]...

** By messing around with linedefs and sector references, a WAD author can create an invisible wall or platform. This was discovered by the author of the UAC_Dead PWAD, who famously used the effect to create an IndianaJones style invisible staircase, complete with candles on either side of the steps.

** By messing around with linedefs and sector references, a WAD author can create an invisible wall or platform. This was discovered by the author of UAC_Dead, who famously used the effect to create an IndianaJones style invisible staircase, complete with candles on either side of the steps.

* There is a way to make the Witch harmless in ''Left4Dead2'' if you have a gas can and a propane tank or grenade launcher. When the Witch is hit by an explosion directly, she stumbles and then freaks out and attacks. However, if she stumbles and gets set on fire at the exact same time, the Witch flails about as she burns to death while not attacking anyone since her AI still thinks it is in stumble mode. This can be a life saver on Expert and Realism.

* Rareware's legendary [[{{Nintendo 64}} N64]] shooter ''Game/GoldenEye'' has a particularly hilarious glitch that, when triggered, makes the character models fidget erratically, along with the vehicle models. [[http://www.youtube.com/watch?v=lFVN8CW5IWE& Combine this with some catchy dance music]], and you've got some serious MemeticMutation going on. '''''[[http://www.youtube.com/watch?v=h3quTc2-GyM GET]] [[http://www.youtube.com/watch?v=FDW3jXcOBzo DOWN!]]'''''

* Tobias Bruckner in ''{{Turok}}: Evolution'' became a byword for terrible final bosses when, after doing absolutely nothing for the entire span of the game, the genocidal cowboy antagonist who killed the eponymous Indian's tribe appears riding a T-Rex for no reason at all. 90% of the time he won't move unless the player moves closer to him, leading to a grand finale of unloading your gun into a completely stationary target.

* ''Turok 2: Seeds of Evil'', being made in the days before console online gaming, allowed one to access cheats during multiplayer mode. While this leads to interesting situations like infinite ammo missile launchers, the cheats also include a level skip function. This effectively turns the game into a two-player co-operative game. In addition to that, you can play the multiplayer with just one player. This means you can play as different characters with different speed and health settings, including the [[FragileSpeedster velociraptor,]] which can only use a melee attack.

* Tobias Bruckner in ''{{Turok}}: Evolution'' became a byword for terrible final bosses when, after doing absolutely nothing for the entire span of the game, the genocidal cowboy antagonist who killed the titular Indian's tribe appears riding a T-Rex for no reason at all. 90% of the time he won't move unless the player moves closer to him, leading to a grand finale of unloading your gun into a completely stationary target.

*** It was also possible in one level to beat a level in three seconds. When you spawned, you could see the map's goal (The Eye) twinkling off in the distance. Down two speed potions, run like hell towards it, and jump with a mighty jump. TaaDAA! Then walk out the exit, located about twelve steps away. Since the level also had those damn zombies you couldn't hide from (or kill without holy water or fire arrows) this was a hell of a lot more fun!

* ''Turok 2: Seeds of Evil'', being made in the days before console online gaming, allowed one to access cheats during multiplayer mode. While this leads to interesting situations like infinite ammo missile launchers, the cheats also include a level skip function. This effectively turns the game into a two-player co-operative game. In addition to that, you can play the multiplayer with just one player. This means you can play as different characters with different speed and health settings, including the [[FragileSpeedster velociraptor,]] which can only use a melee attack.

* In the preview build of ''VideoGame/DeusExHumanRevolution'', the combat system allows you to walk up to unsuspecting enemies and either kill them or knock them out with a scripted takedown animation (and later, you can learn a double takedown). Unfortunately, it appears that the game scripters (whether intentionally or not) applied the same takedown animations to ''civilians''. This means that you can walk up to random people and perform hilarious moves, like [[http://www.youtube.com/watch?v=pEWoVsF0MIo&feature=related coldcocking a prostitute in the face while her friends look on]], punching someone so hard that it apparently breaks the sound barrier and [[http://www.youtube.com/watch?v=zYpuzHyEY8Q&feature=related taking down two civilians who've suddenly gained combat skills]].