A common bonus feature or EasterEgg in later installments in a VideoGame franchise is to hide a copy of an earlier game from the series in the current game.

This is usually (but not always) a hard-to-find special bonus, often an OldSaveBonus or NewGamePlus. Additional rewards may be offered for beating the embedded game. For technical reasons, this tends to be limited to games which have a very primitive previous incarnation.

'''Subtrope of GameWithinAGame''' and as such has to be recreated/emulated by the game itself, it's not the original game bundled with the new one or downloadable for free. See also NostalgiaLevel. Has nothing to do with {{Precursors}}.
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!!Video game examples:

* ''Sega Smash Pack: Volume 1'' for the Dreamcast doesn't include any older games per se, but it does [[http://dcemulation.org/files/emulators/esmpkrl/ECHELON.TXT secretly include an entire Genesis/MegaDrive emulator]], allowing hundreds of old games to be played on the Dreamcast.
* One of the bonuses for connecting ''VideoGame/MetroidPrime'' to ''VideoGame/{{Metroid}} Fusion'' was a playable copy of the original ''Metroid''. And after beating ''[[VideoGame/{{Metroid}} Metroid Zero Mission]]'' once, the original ''Metroid'' was unlocked on the options menu.
* ''VideoGame/{{Pitfall}}: Mayan Adventure'' has a hidden copy of the original ''Pitfall'' hidden inside it. So does ''VideoGame/Pitfall3DBeyondTheJungle'', via a password, and ''VideoGame/PitfallTheLostExpedition''. ''The Big Adventure'', a remake of ''The Lost Expedition'', takes it one step further by having ''both'' the original {{Atari 2600}} ''Pitfall'' games as unlockables.
* The 2010 version of ''{{Splatterhouse}}'' includes the original original arcade game and both Genesis sequels.
* ''Franchise/DonkeyKong'':
** ''DonkeyKong94'' has levels from the original ''VideoGame/DonkeyKong'' as its first four levels, and a more balanced to the game's mechanics remake of the first level as one of its last levels.
** ''VideoGame/DonkeyKong64'' features working arcade machines on which the player can play the original ''VideoGame/DonkeyKong'' and ''VideoGame/{{Jetpac}}'' (Rare's first game back when they were named "Ultimate Play the Game") to win a reward token. These tokens are actually necessary to beat the game.
* ''Franchise/SuperMarioBros'':
** In ''VideoGame/SuperMarioBros3'', players collect cards at the end of most levels. In a two-player game, if one player is on the same square in the map as the other player, either player can press a button to enter a fight. This fight is played as a round of a slightly modified version of the original ''VideoGame/MarioBros''. The player can steal cards from the other player to earn 1-[=UPs=], and the winner gets to go to the next level. ''[[CompilationRerelease Super Mario All-Stars]]'' also includes said battle mode as a separate mode on the title screen of ''[=SMB3=]'', so does every [[VideogameRemake Super Mario Advance]] game, as well as ''[[VideoGame/MarioAndLuigiSuperstarSaga Mario & Luigi: Superstar Saga]]''.
** ''VideoGame/SuperMario3DWorld'' features a slightly tweaked version of the original arcade game called ''Luigi Bros.'' (obviously meant to cap off TheYearOfLuigi). It's unlocked by beating the game or having a ''VideoGame/NewSuperLuigiU'' [[OldSaveBonus save game on your Wii U.]]
* ''[[PrinceOfPersia Prince of Persia: The Sands of Time]]'' included the original ''Prince of Persia'' as a bonus. It was reached by opening a hidden door, walking up a staircase, and passing out of view. The dialogue sets it up just prior: "They say this castle was built on the ruins of an even more ancient one..." The Xbox version also included ''Prince of Persia 2''.
* The 1990s PC version of ''SpaceInvaders'' lets you play the original Space Invaders once you've beaten the game on Hard.
* ''VideoGame/SonicAdventure DX'' for the GameCube and PC has every single ''Sonic'' GameGear game released, from the original 8-bit ''VideoGame/SonicTheHedgehog'' (acquired by collecting 20 Emblems) to ''VideoGame/SonicBlast'' and ''Tails Adventures'' (acquired by getting all Emblems and completing Mission Mode).
* ''ReturnToCastleWolfenstein'' contained ''VideoGame/Wolfenstein3D''.
* ''VideoGame/PacMan2TheNewAdventures'' for the SNES contains both ''VideoGame/PacMan'' and, in an example of a {{Sidequest}} for an EasterEgg, ''Ms. Pac-Man''. The Genesis version had an original game, ''Pac-Jr.'', in lieu of ''Ms. Pac-Man'' (since ''Ms. Pac-Man'' already had a stand-alone release for the Genesis). ''Pac-Man World 2'' also includes ''Pac-Man, Ms. Pac-Man, Pac-Attack,'' and ''Pac-Mania.''
* ''VideoGame/PanzerDragoon Orta'', the fourth game, contains an unlockable port of the first.
* ''VideoGame/DayOfTheTentacle'' was the sequel to ''VideoGame/ManiacMansion'' and has a fully playable version of it in the game. Just like the original version, it only had one save slot.
* A minor selling point for ''[[RogueSquadron Star Wars: Rebel Strike]]'' (It was mentioned on the back of the box) was the fact that an almost complete version (minus the Empire based bonus missions) of the previous game, ''Rogue Leader'', was available for co-op play. The game also includes ports of the Atari arcade games ''Star Wars'', ''The Empire Strikes Back'' and ''Return of the Jedi'', which can be earned through game play and/or by pass code.
* ''VideoGame/HouseOfTheDead 3'' for the Xbox contains the full version of ''House of the Dead 2''. Incidentally, much later came ''House of the Dead 2 & 3 Return'' on the Wii. The Dreamcast version of ''House of the Dead 2'' was supposed to include an [[VideogameRemake Enhanced Remake]] of the original title, but it wasn't implemented due to time constraints.
* The [[LimitedSpecialCollectorsUltimateEdition Hardened and Prestige Editions]] of ''ModernWarfare 2'' include a free redemption code for the XboxLiveArcade[=/=]PlaystationNetwork port of the first ''VideoGame/CallOfDuty''.
* ''Tetris Worlds'' contained a re-creation of the original ''VideoGame/{{Tetris}}'', prior to the ExecutiveMeddling that introduced infinite spin and T-spin triples, complete with monochrome blocks made out of bracket characters.
* ''VideoGame/SuperSmashBros Brawl'' features the ability to unlock several games from the various video game franchises represented. These are all timed demos though due to the existence of the Virtual Console. With Wii modding, it is possible to play these games not as timed demos, but as full games.
* ''Franchise/MetalGear'':
** The second disc of ''[[VideoGame/MetalGearSolid3SnakeEater Metal Gear Solid 3: Subsistence]]'' includes the original ''VideoGame/MetalGear'' and ''VideoGame/MetalGear2SolidSnake''. The ports included on the disc are actually based the cellphone rereleases that were released in Japan around the same time as the original ''Metal Gear Solid 3'', meaning that the updated ''Metal Gear 2'' no longer used the photo-realistic character designs from the [=MSX2=] original (thus, no more SeanConnery as Big Boss and no more Creator/MelGibson as Solid Snake). Both games are retained and also selectable form the main menu in the HD Collection version on the PS3 and Xbox360.
** The ''Metal Gear Solid 2: Bande Dessinée'' DVD in Japan includes a fully voiced version of the original ''Digital Graphic Novel'' that was released for the PSP.
* ''Contra 4'' for the Nintendo DS features the NES versions of ''{{Contra}}'' and ''Super C'', but they're only available after completing 4 and 8 stages respectively in Challenge Mode. They play almost exactly like the original NES games, right down to having the same cheat codes, except there's no proper 2-Player mode in either game. Instead, both characters are mapped to the same d-pad, but their firing and jumping buttons are mapped differently (Y and B for Player 1, X and A for Player 2).
* ''Franchise/{{Castlevania}}'':
** In something of an inversion, ''VideoGame/CastlevaniaSymphonyOfTheNight'' has the final boss fight from the [[VideoGame/CastlevaniaRondoOfBlood preceding game]] as the opening level (although it's referred to as "Bloodlines" in the English localization). Furthermore, the player's performance in the flashback level determines Alucard's starting stats and items.
** ''[[VideoGame/CastlevaniaTheDraculaXChronicles The Dracula X Chronicles]],'' the PSP remake of ''Rondo of Blood'', contains both ''Symphony of the Night'' and the original ''Rondo of Blood''.
** ''VideoGame/CastlevaniaLegacyOfDarkness'' allows the player to unlock remixed versions of Reinhart's and Carrie's quest from the previous ''Castlevania'' game for the {{Nintendo 64}}, complete with cut-scenes and everything, but only after completing the main quest with Cornell. However, since Cornell's portion is technically a MissionPackSequel to the first [=N64=] ''Castlevania'', ''Legacy of Darkness'' as a whole is really more of an UpdatedRerelease of the first game than a sequel.
* ''VideoGame/KingdomHeartsII: [[UpdatedRerelease Final Mix+]]'' has a [[VideoGameRemake remade]] midquel given almost equal billing to the game itself, ''Re: Chain of Memories'', which takes the GBA sprite game and turns it into a full-fledged 3D PS2 game. However, that is a standalone release in America (and thus merely an remake), with [[NoExportForYou no signs of]] ''[[NoExportForYou Final Mix]]'' [[NoExportForYou going overseas]].
* ''[[ChocobosDungeon Final Fantasy Fables: Chocobo's Dungeon]]'': Tokiwasure no Meikyuu features a mini-game with card-based battling... Effectively the entire battle/gameplay of it's DS predecessor, ''ChocoboTales''.
* ''Rodland''. In the arcade version, imputting a code on the title screen once you put a coin in unlocks ''a sequel that never saw a standalone release''.
* ''[[TeenageMutantNinjaTurtles TMNT2: Battle Nexus]]'' and ''[=TMNT3=]: Mutant Nightmare'' include ports of [[VideoGame/TeenageMutantNinjaTurtlesTheArcadeGame the original arcade game]] and ''[[VideoGame/TeenageMutantNinjaTurtlesTurtlesInTime Turtles in Time]]'' respectively.
* The [[LimitedSpecialCollectorsUltimateEdition Premium Pack/Kollector's Edition]] of ''MortalKombat: Deception'' has the original ''Mortal Kombat'', ''Mortal Kombat: Shaolin Monks'' has ''Mortal Kombat II'' as an unlockable (relevant, as ''Shaolin Monks'' is essentially a retelling of ''[=MK2=]'') and looking at the pattern, you can tell what the Limited Edition of ''Mortal Kombat: Armageddon'' includes.
* ''[[VideoGame/TalesOfPhantasia Tales of Phantasia: Narikiri Dungeon X]]'' (PSP) features (an updated version of) ''Tales of Phantasia'' in the same UMD.
* The Wii version of ''VideoGame/IndianaJonesAndTheStaffOfKings'' includes the PC game ''IndianaJonesAndTheFateOfAtlantis'' (voiced version).
* ''Franchise/TheChroniclesOfRiddick: VideoGame/AssaultOnDarkAthena'' contains its Xbox predecessor ''VideoGame/EscapeFromButcherBay'' with enhanced graphics.
* The GameCube version of ''Fight Night: Round 2'' includes the SNES version of ''[[VideoGame/PunchOut Super Punch-Out!!]]''.
* The {{Xbox}} version of ''NinjaGaiden'' features the three NES games in the franchise (although they're based on the updated versions from the ''Ninja Gaiden Trilogy'' compilation for the SNES and not on the actual NES originals). To play them, you need to find their corresponding cartridges and use them with an arcade cabinet in Tairon. If you beat the game after finding the cartridges, you can play them from the main menu. The [[UpdatedRerelease expanded version]], ''Ninja Gaiden Black'', includes the arcade game as well.
* ''VideoGame/WreckingCrew '98'' for the Super Famicom includes the original NES game.
* The arcade version of ''VideoGame/DanceDanceRevolution 3rd MIX'' has a hidden "2nd Mix" mode that allows you to play songs from DDR 1st and 2nd Mixes, with the exception of "Strictly Business". And much thankfully, with 3rd Mix's difficulty selection method so you don't have to [[GuideDangIt enter a code]] for Another or Maniac difficulties. In comparison, ''2nd MIX'' gets revisited as a separate mode again in ''Dance Dance Revolution X3'', this time in higher resolution and with the actual ''2nd MIX'' interface, rather than just swapping out songlists and keeping the interface intact. Subverted, in that ''2nd MIX'' mode includes two brand new boss songs that weren't there in the original version.
* In ''VideoGame/{{Kirby}} Super Star'', the first game that you're allowed to play, Spring Breeze, is actually a condensed remake of the first game in the series, Kirby's Dream Land. (minus Castle Lololo and Kaboola)
* ''Kirby Super Star [[VideoGameRemake Ultra]]'' not only has Spring Breeze, but a remake of ''Dream Land'''s Extra Game (essentially Hard mode) called Revenge of the King (which brings back Kaboola).
* ''VideoGame/{{Tekken}} 5'' included fully-playable Arcade versions of the first three ''Tekken'' games. You can also unlock the full version of Namco's old space shooter StarBlade by finding the spaceship from that game in one of the stages of Devil Within. Usually you get to play the first part of the game when Tekken 5 itself is starting up.
* ''FireEmblem: [[FireEmblemAkaneia Mystery of the Emblem]]'' had this in a sense. It contained both a remake of the first and its sequel, though both were available from the beginning. In turn, its remake ''New Mystery of the Emblem'' contains remakes of the obscure ''BS Fire Emblem: Akaneia Saga'' {{Satellaview}} games as unlockable bonuses.
* The Xbox version of the remake of ''SpyHunter'' included the original ''Spy Hunter'' ArcadeGame.
* ''[[NintendoWars Super Famicom Wars]]'' has all the maps from the original ''Famicom Wars'' in addition to all the new ones made for the game.
* Unusually for a current-gen precursor, the entire (slightly-altered) Story Mode of ''DissidiaFinalFantasy'' is included in its sequel.
* A visual novel example, {{Narcissu}} is added as an embedded package to its prequel, called "Narcissu ~Side 2nd~".
* ''VideoGame/AliceMadnessReturns'' includes a high-definition port of [[AmericanMcGeesAlice the original game]] as a bonus to players who are willing to pay extra, or those who preordered the game in advance.
* ''VideoGame/SonicGenerations'' includes a port of the original 16-bit ''VideoGame/SonicTheHedgehog'' as a bonus, but only in the console version.
* ''VideoGame/Left4Dead2'' now contains ports of all the campaigns from the first ''VideoGame/Left4Dead''.
* ''[[VideoGame/TronTwoPointOh Tron 2.0: Killer App]]'' for the GameBoyAdvance incorporates the old ''Tron'' {{Arcade Game}}s by Midway.
* ''Super VideoGame/StreetFighterII Turbo HD Remix'' has regular ''[=SSF2T=]'' inside.
* Played with in ''[[VideoGame/TonyHawksProSkater Tony Hawk's Underground]]''. After creating a character, you can briefly see the game box for ''Tony Hawk's Pro Skater 4'' on the desk.
* First editions of the PS3-version of ''[[VideoGame/AssassinsCreedRevelations Assassin's Creed: Revelations]]'' include the original ''[[VideoGame/AssassinsCreedI Assassin's Creed]]''.
* The PS3 version of ''[[VideoGame/BioshockInfinite Bioshock Infinite]]'' comes with the original ''[[VideoGame/BioShock1 Bioshock]]''.
* Giana Sisters DS has every level from the original Great Giana Sisters as an unlockable.
* White Knight Chronicles 2 came with the prequel as well, updated to reflect the changed (read: better) combat system.
* EA Sports will tend to include a classic iteration of a sports game; ''Madden 2002'' included ''Madden '92'', ''FIFA 06'' included ''FIFA International Soccer'', and ''NHL 06'' included ''NHL '94'' (due to licensing issues, all the older versions contained modern rosters instead of their original ones).
* ''RaymanLegends'' contains levels from its prequel, ''RaymanOrigins'' that you unlock by collecting Lucky Tickets.
* ''VideoGame/{{Bayonetta 2}}'' will come with [[VideoGame/{{Bayonetta}} its predecessor]] packed in with some Creator/{{Nintendo}}-related costumes and reskins included (Wicked Weaves being replaced with [[Franchise/SuperMarioBros Bowser's]] limbs, for instance). Notably, it will also bring said predecessor to a [[Main/WiiU Nintendo console]] for the first time.

!!Non-videogame examples:
* TabletopGames example: the ''DungeonsAndDragons'' boxed set ''Return to the Tomb of Horrors'' had a copy of the original module S1 TombOfHorrors'' included in it. The original Tomb was placed within the larger adventure and could be entered and explored.
* The Commodore 128 turned itself into a {{Commodore 64}} if you typed "Go 64." The ZXSpectrum did the same thing (the +2 had a 48K mode, selectable from the startup menu) for the exact same purpose: [[DaddySystem backwards compatibility]].
* LeonardBernstein wrote a sequel to ''Trouble in Tahiti'', the full-length opera ''A Quiet Place'', which in the end included all seven scenes of ''Trouble in Tahiti'' as a pair of {{Pensieve Flashback}}s in the second act.
* The Brazilian publisher of Disney comics released a collection to celebrate the 60th anniversary of their DonaldDuck comic. A fac-simile of ''The Donald Duck #1'' (yes, the first issues had an article) came along with the first issue.
* The DVD releases of MostExtremeEliminationChallenge include a few unedited original episodes of ''TakeshisCastle'' which is longer than the show's edit that puts the show into it's proper context. The catch is however that it contains forced proper english subtitles and an optional english announcer (but only for the first season, that option's been removed for Season 2, Volume 3, and the Volume 4 and 5 two pack.).
* The DVD for ''Film/HouseOfWax1953'' includes the film it was a remake of, ''Mystery of the Wax Museum'' (1933) as a bonus feature.
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