[[caption-width-right:250:''[[ThisIsGonnaSuck Doggone it, Minnie...]]'']]

''Castle of Illusion: [[WesternAnimation/MickeyMouse Starring Mickey Mouse]]'' is a platformer developed by Creator/{{Sega}} in 1990 for the UsefulNotes/SegaGenesis and UsefulNotes/SegaMasterSystem.

The game takes place within the eponymous Castle Of Illusion. Mickey must take it upon himself to rescue WesternAnimation/MinnieMouse from the clutches of [[PunnyName Mizrabel]] [[WickedWitch the witch]], who has kidnapped her in order to steal her youth and beauty. The player must battle through five stages and confront each stage's boss to collect the Seven Gems of the Rainbow. Only with these gems can he then build a rainbow bridge leading to the castle tower to face the evil witch in a {{final b|oss}}attle.

Cue classic side-scrolling and all the glory of 16-bit graphics and sound.

In 1992, it went and had two sequels: ''VideoGame/LandOfIllusion'' and ''VideoGame/WorldOfIllusion''. A few years later, an additional sequel was released known as ''Legend of Illusion''. 2012 saw a UsefulNotes/Nintendo3DS companion game to ''VideoGame/EpicMickey2ThePowerOfTwo'' going under the name ''VideoGame/EpicMickeyPowerOfIllusion'', officially billed as both a fourth, direct sequel and an ''Epic Mickey'' game, in which the Castle of Illusion has been transported to the Wasteland and Mizrabel seeks to escape from it by draining the essence of popular Disney characters.

In the wake of this release, Sega made a [[VideoGameRemake HD Remake]] of the original game and was released on the UsefulNotes/PlayStation3 on September 3, 2013, while the UsefulNotes/{{Steam}} and UsefulNotes/{{Xbox 360}} versions were released the following day. The game was delisted from these storefronts on September 2, 2016, due to Sega's contract expiring; it eventually resurfaced in April of 2017.
!! This game provides examples of:
* AbnormalAmmo: The Genesis game gives you apples, marbles, and candles to throw at your foes.
* AllThereInTheManual: In the remake, collecting each of the two statue pieces per world unlocks a statue of the world's boss, along with a bio explaining their personality and/or why they have one of the Rainbow Gems in their possession.
* AndYourRewardIsClothes: The remake features three unlockable costumes for Mickey to wear. The costumes are an explorer's outfit that is unlocked by finding all the chili peppers, a magician's outfit unlocked by finding all the playing cards, and a knight's suit of armor that is unlocked by defeating Mizrabel.
* AnthropomorphicShift: In the original, Mizrabel's true form is a mouse person like Mickey and Minnie. The remake has her as a human.
* AsteroidsMonster: The letter A's from the Master System version split into three smaller versions when attacked.
* AutoScrollingLevel: The Master System version has two: the first section of the cakes and sweets level, and the second section of Mizrabel's castle. The latter even features a moment where Mickey must let the auto-scrolling catch up with him to push him through a narrow passageway.
* {{Backtracking}}: In one of the sections in the second level in the Genesis version, the door to exit is at the beginning of the level, but you need to climb all the way to the top to find the key. Thankfully, you don't need to retrace the level; when you pick up the key, the platforms turn into ramps and you slide down all the way back to the exit.
* BossOnlyLevel: The third stage of each level in the remake.
* BottomlessPits: A standard hazard.
* BrokenBridge: In the remake, you won't be allowed to enter each level until you have collected enough diamonds.
* CallingYourAttacks: The Mizrabel battle in the remake.
* TheCameo: In the remake, WesternAnimation/{{Pluto|ThePup}}, Huey, Dewey, Louie, WesternAnimation/{{Goofy}}, WesternAnimation/DonaldDuck, Daisy Duck, Scrooge [=McDuck=], Chip, Dale and WesternAnimation/{{Pete}} can be seen watching the events of the game as a movie alongside Mickey and Minnie.
* ClockTower: The fifth level of the Master System game, part of the fifth level in the Genesis version and also a level in the HD remake.
* DamselInDistress: The main objective of the game is to rescue Minnie Mouse.
* DarkerAndEdgier: While not completely dark, the remake has a more ominous feel to it and many of the enemies and bosses are redesigned so that they look less cartoonish.
* DefeatMeansFriendship:
** In the Genesis version, when Mickey ends up defeating the evil witch and preventing her from stealing Minnie's youth, she actually takes them both back home. On her broom. Whilst they snuggle up on a bench swing.
** The remake has Mizrabel give Mickey and Minnie their own brooms to escape the falling castle, and it also adds a reason as to ''why'' DefeatMeansFriendship: it turns out it's a case of KnowWhenToFoldEm. Mizrabel, as the narrator explains, had the wisdom to know when she was defeated, and also to know the reason ''why'' that was so, and it's because she recognized that Mickey and Minnie had a magic even greater than her own: ThePowerOfLove.
* EasierThanEasy: The easiest difficulty level, aptly named "Practice", is essentially a heavily abridged version of the full game. Large sections of each level are omitted, and also...
** EasyModeMockery: The game ends at the 3rd level. However, this is a subversion, as the ending is somewhat more hopeful: Mizrabel has a change of heart and agrees to free Minnie in exchange for just three gems, then does so without any insults at all. The text telling you to try Normal mode is also more encouraging than insulting.
* {{Expy}}:
** The evil witch's character model is based on Queen Grimhilde from ''Disney/SnowWhiteAndTheSevenDwarfs'' (better known as simply "the Evil Queen")--both in her "hag" guise when she's old, and in her normal incarnation when she's becoming younger in the final battle. The remake takes it further by having her say she wants to be the fairest one of all.
** ''Land Of Illusion'' has the Phantom as the final boss...but he's a recoloured version of The Horned King from Disney's ''Disney/TheBlackCauldron''!
* FollowTheMoney: Diamonds in the Genesis version.
* FullyDressedCartoonAnimal: Minnie, in the remake, wears a red shirt.
* GoombaSpringboard: Mickey can use {{Goomba Stomp}}s to jump higher, if he needs to do so.
* GoombaStomp: Unlike most games that feature this, ''Castle of Illusion'' requires an additional button press in mid-jump in order to stomp enemies, making it more like a GroundPound than usual. The HD remake doesn't require the extra button press.
* GuideDangIt: The intro in the original has Mickey making quick work of three guards by jumping on them. Then when you try it yourself, Mickey gets hurt because you need to press the jump button ''again'' to take out an enemy.
* HeartContainer: Present in the Master System version, although as stars rather than hearts. Mickey starts out with three stars' worth of health, but can pick up extra ones in Toyland and the Clock Tower.
* HubWorld: Mizrabel's Castle of Illusion is this once you finish the introduction level.
* HyperactiveMetabolism: Cake in the Master System version. A slice of cake heals one star's worth of damage, a whole cake heals Mickey back to full health.
* LedgeBats: In the third level of the Genesis game. The bats have a tendency to jump out at you right as you're crossing a gap.
* LevelAte: The third level of the Master System game is entirely make of cakes, chocolate, and other confectionery, with a giant chocolate bar as a boss. The "milk bottle" section of the fourth level of the Genesis game is likewise made of assorted sweet foods.
* LoadBearingBoss: A strange example of this. Once the final boss is defeated, the castle begins to fall apart, likely as a result of the battle, considering she's still alive and in fact has to flee alongside the heroes.
* TheLostWoods: The first level of both games is a grassy woodland. In the Genesis game, it phases from GreenHillZone through deeper and darker (and, in some places, spider-filled) woods to a [[BigBoosHaunt haunted forest]] toward the end.
* LuckySeven: Seven gems, seven bosses (six in the Genesis version).
* MacroZone: A giant study or library forms part of the fourth level of the Genesis game and the entirety of the fourth level of the Master System game.
* MythologyGag:
** In the remake, Chip and Dale are dressed in their [[WesternAnimation/ChipNDaleRescueRangers Rescue Rangers]] attire.
** In level 5 of the remake, the narrator brings up Mickey's [[Disney/ClockCleaners past experience in cleaning clocks]].
** The giant apple chase segment in the level 1 remake is a homage to the chase segments in ''VideoGame/MickeyMania''.
** A milk bottlecap in level 4 of the remake has Mickey in his 1930's design.
* NeverSayDie: Lives are referred to as "tries".
* PaletteSwap: The Clockmaker boss is a recolored [[Disney/FunAndFancyFree Willie the Giant]].
* ThePowerOfLove: Is what leads to Mizrabel's HeelFaceTurn.
* PreorderBonus: Playstation 3 owners who preordered the HD remake between August 20th and September 3rd received three avatars, a dynamic theme and the original Genesis/Mega Drive version of the game.
* PunnyName: Mizrabel. [[DontExplainTheJoke Because she's Miserable.]]
* QuicksandSucks: In the ToyTime stage. Okay, it's more like Quick-Jelly, but it definitely Sucks.
* RoguesGalleryTransplant: ''Legend of Illusion'' features Merlock the Magician, the main villain of the WesternAnimation/DuckTales [[WesternAnimation/DuckTalesTheMovieTreasureoftheLostLamp movie]] as one of the bosses, though he is only referred to as Evil Magician.
* ShoutOut: Two of the collectibles of the remake are "[[VideoGame/{{Quackshot}} Donald's chili peppers]]" and "[[VideoGame/WorldOfIllusion magic playing cards]]". And in case you thought it was a coincidence, the trophies/achievements you get for collecting them all are the names of these two games!
* SpringJump: The second level has springboards for you to jump on.
* SuperNotDrowningSkills:
** In the stages where you can swim, you never run out of air.
** Averted in the Master System sequel ''Land of Illusion''.
* TacticalSuicideBoss: You can't jump high enough to stomp the second stage boss. Don't worry, he'll start releasing helpful springs for no real other reason than chivalry. You can also cheese him by hiding in a corner.
* ToyTime: The second level of both games.
* TheUnfought: Shadow Mickey, who's exclusive to the remake. You spend the entire second act of level 4 chasing him to retrieve the green gem, but instead of actually ''fighting'' him, he's brained in the head by a giant spoon as you escape into a giant teacup. You then have to escape the teacup, but after you do ''that'', Mickey simply retrieves the green gem from the dazed Shadow Mickey.
* UnlockableContent: The remake features some. Aside from the aforementioned costumes, you are also able to unlock concept art for every diamond you collect that isn't used to gain access to the levels and you can find a statue piece in the first two stages of each level to unlock statues of the bosses.
* WaterLevel: The third level of the Genesis game, which transitions from a lake with islands to flooded ruins.
* WhenTreesAttack: The first stage boss in the Genesis version is a living log that jumps out of the tree it's resting in and rolls towards you. What? ItMakesSenseInContext... sort of. The Master System version just has a tree as the first boss. The remake adds an explanation, sort of. The narrator refers to this boss as the "grumpy old oak"; so apparently it was attacking Mickey either just because it was a grouch, or because Mickey woke it up or something.
* YouAreTooLate: In both the Genesis and HD versions, ''just'' as Mickey finally arrives at the final room to save Minnie, Mizrabel completes the first part of the spell and makes herself look much younger. Fortunately, Mickey manages to beat Mizrabel before the last part of the spell (turning Minnie into an old crone) is complete, so Mickey is able to foil Mizrabel's plan anyway.