Sometimes a VideoGame instruction manual, in the progress of describing gameplay controls or mechanics, will reveal information that was otherwise intended to be a surprise for the player as he plays the game.

For example, an illustration may depict characters that join the player's party late in the game, describe enemies or bosses he may fight in a particular area, or discuss how to control the player's GlobalAirship.

This is related to TrailersAlwaysSpoil and SpoilerOpening. See InterfaceSpoiler where the spoiling is done by an interface element instead of a manual.

* ''VideoGame/SuperSmashBros.'' has the following:
** ''Melee's'' instruction book shows in some pics that [[Franchise/SuperMarioBros Luigi]], [[VideoGame/DrMario Dr. Mario]], [[VideoGame/FireEmblemElibe Roy]], [[VideoGame/TheLegendOfZeldaOcarinaOfTime Young Link]] and [[Franchise/{{Pokemon}} Mewtwo]] are playable.
** ''Brawl's'' manual shows [[Franchise/MetalGear Snake]] and Franchise/{{Sonic|TheHedgehog}}, although [[TrailersAlwaysSpoil their presence is not much of a secret]].
*** Heck, you don't even need the manual for this one. Just look at the back of the box and see the two non nintendo characters taking up roughly a third of the illustrations.
* In the instructions for ''VideoGame/MarioGolf: Toadstool Tour'', there is a pic of the character selection screen. With every secret character unlocked.
* The European reprinted manuals for a number of [[SegaGenesis Sega Genesis/Mega Drive]] games were more complete but would often spoil details like the name or layout of later levels or enemy types, including bosses. Off the top of my head:
** The ''VideoGame/SonicTheHedgehog'' manual would spoil the name and traps of every act, as well as [[spoiler: the existence and purpose of the Final Zone]].
** The ''Shadow Dancer'' manual allowed you to know how many final rooms there were before the FinalBoss.
** The ''VideoGame/StreetsOfRage'' manual spoiled the hazards of each stage, most notably the elevator from Stage 7.
** The Genesis's version of ''VideoGame/TeenageMutantNinjaTurtlesTournamentFighters'''s manual spoiled its [[SNKBoss SNKBosses]].
* The series ''Franchise/FinalFantasy'' has a few:
** The manual of the SNES American release of ''VideoGame/FinalFantasyIV'' - in the equipment section in the back, it lists the classes of all the characters, to designate what each can equip. Particularly blatant in the case of Edge and [=FuSoYa=], since you know there's more game coming after each DiscOneFinalDungeon because you haven't met a ninja or Lunarian yet.
** ''VideoGame/FinalFantasyVI'' came with a physical map of the World Map (''both of them''), with every dungeon labeled.
** ''VideoGame/FinalFantasyX'' manual contains information about three party members and four aeons that aren't present early on and whose eventual appearances are supposed to be surprising at varying degrees.
** ''VideoGame/FinalFantasyXII'' explains that Basch and Ashe will join your party, even though they're both supposed to be dead after the prologue.
** The ''VideoGame/FinalFantasyXIII'' game manual reveals that Lightning's party will be joined by TheSixthRanger Fang and land on Pulse. But then again, they aren't very big spoilers, as it's been in every trailer and review.
* The manual for ''VideoGame/TheWorldEndsWithYou'' discusses the controls for all three of your partners, somewhat spoiling the "YourPrincessIsInAnotherCastle" moment where it looks like the game's over after week 1 because you haven't even ''met'' one of them yet.
* ''VideoGame/TalesOfSymphonia'''s manual spoils the identities of four eventual party members, and eagle-eyed gamers can spot clues that [[spoiler:there is another world involved]].
* The manual for ''VideoGame/MetalGearSolid2'' reveals the game's use of a DecoyProtagonist.
* The American manual of ''VideoGame/SonicTheHedgehog2'' doesn't tell the player about Death Egg Zone on its level list, but reveals what Dr. Eggman's Giant Mech/Death Egg Robot looks like on page 4.
* ''VideoGame/GoldenSun: The Lost Age'' sets up three members of the hero's four-member party, and his alliance with Alex, an Adept of the fourth element... who is not with them on the box art. A random sailor you encounter very briefly and don't see again until ''almost halfway through the game'' is. Hint, hint. Also spoilered in the manual proper when it includes instructions on how to navigate with Piers's ship, and the [[{{Feelies}} map and relationship chart]] that come with the game also spell out that Piers is playable and Alex is not.
** Also subverted, in that the {{Feelies}} make a big fuss about Sheba's power of precognition... and it ''never even comes up'' in the game, aside from one line insisting it's her destiny to travel with Felix (and she later admits she was ''lying'' about that).
** Speaking of {{Feelies}}, a similar relationship chart was created for ''VideoGame/GoldenSunDarkDawn'' and pulled (and leaked on the Internet) at the last minute because it spilled the beans on [[ShipSinking Matthew's ancestry]]... and [[HeroicBastard Amiti's]], which was ''supposed'' to be a big unresolved plot point!
* The manual for ''VideoGame/TheLegendOfDragoon'' spoils the fact that Lloyd is a Wingly. Not that it's hard to figure out, but it's not actually revealed until the third disc. It also spoils the complete endgame party.
* ''VideoGame/{{Mega Man X}}5'', the intended GrandFinale of the ''X'' series (it was supposed to lead into ''[[VideoGame/MegaManZero Zero]]'' until [[ExecutiveMeddling Capcom went ahead]] and made ''X6'' without Keiji Inafune's knowledge or consent, forcing him to change around the plot), had Zero dying at its close... [[KilledOffForReal for good.]] In spite of this, ''X6'' brought him back with the half-baked explanation that Zero was in hiding, repairing himself (although Zero notes in a discussion with Dr. Light that he has no knowledge of who really repaired him while in his near-death state). The fact that Zero was alive was spoiled by the game manual speaking of another playable character, a "resurrected Hunter" whose profile, weaponry, and skillset fits Zero to the bill. Never mind that the back of the game case has the words "Zero is missing" in big, honking letters.
** Lampshaded in the case of ''VideoGame/MegaManXCommandMission'', where Colonel Redips's name was intentionally misspelled as "Rideps" in the manual to prevent giving away the plot twist that he was TheMole (by disguising as "Spider") and the ultimate BigBad.
* ''Tecmo's VideoGame/{{Deception}}'' has the manual give away the fact that [[spoiler:Fiana]] is an acquirable summoned monster.
* The manuals of ''VideoGame/CommandAndConquer'' and ''Red Alert'' give you the full tech-tree, including the factions' super-weapons. It thus doesn't come as much of a surprise to the player that in the campaigns, Nod develops nukes, GDI has a KillSat, the Iron Curtain project is about temporarily making things invulnerable and the Allies develops a teleporter.
* Subverted in ''VideoGame/GhostTrick''. The manual is carefully written to never make any claims regarding [[spoiler:who you really are]], ensuring that it is completely accurate even after all the [[PlotTwist Plot Twists]].
* ''VideoGame/{{Nightfire}}'' has the general plot of every mission (and pretty much the entire plot of the game) spoiled with a quick look at the manual.
* The page describing the ship's manifest from ''VideoGame/StarControl2'' displays artifacts required to complete the game, such as an Illwrath cloaking device. [[spoiler:Subverted: there is no such device obtainable in the actual game]].
** It's also averted in a broader sense; the manual is written to give the impression that you'll be rejoining and resuming the war from the previous game, hiding the fact that [[spoiler:the war was lost nearly twenty years ago.]]
* The manual for VideoGame/TheBugsBunnyCrazyCastle shows a screenshot of the password screen. The problem? Inputting the password in the screenshot takes you to the last level of the game!
* ''VideoGame/DisneyPrincessEnchantedJourney'''s manual reveals the BigBad, while the game doesn't tell you there ''is'' one until the final battle.