What the Final-Exam Boss or the All the Worlds Are a Stage final level is for a video game, the Megamix Game is for a series. It cherry-picks recognizable content from every preceding entry in the series, mashes them all together in an entertaining way, and perhaps adds some new content to keep it all fresh. For these titles, the Nostalgia Level is the rule, not the exception. This is common to find in Fan Games and ROM hacks that pay tribute to a series' history.
- Castlevania: Harmony of Despair is a crossover between most of the major Castlevania games (primarily focusing on post-Symphony of the Night titles) in the form of a 2D multiplayer game. The playable characters retain abilities from their origin games, and each stage is based on a level from another game.
- The Legend of Zelda:
- Though The Legend of Zelda: Skyward Sword doesn't bring back previous games' locations except Faron Woods from Twilight Princess (which makes sense, since it's chronologically the first entry in the series), it still revisits other kinds of content seen over the course of the series' history, as part of the latter's 25th anniversary: Items note , mechanics note , plot devices note , and copious amounts of Mythology Gag referencing previous games in the series.
- The Legend of Zelda: Breath of the Wild is something of a synthesis of the entire series, with gameplay elements, plot details, themes, and locations alluding to almost every single previous game, to a paradoxical extent given that it cannot be neatly placed in any one of the the series' timelines.
- Toe Jam And Earl: Back in the Groove features nearly everything from the first game, many elements from the second including the Hyperfunk Zone, most of the characters throughout the series, and some new stuff.
Fighting Games (see also Dream Match Game)
- Soulcalibur VI is primarily based on the classic Soulcalibur, considered the point where the series entered the mainstream twenty years prior, and yet features characters, modes, gameplay mechanics, music, and general ideas taken from all corners of the series.
- Super Smash Bros. Ultimate gets a mention here for including nearly every stage and music track from previous entries, in addition to every single fighter in series history returning alongside new ones.
First Person Shooters
- Rainbow Six Critical Hour consist of seven missions taken from the first two Rainbow Six games and the Urban Operation expansion pack redone with Lockdown's engine and gameplay mechanics. The plot is framed as former protagonist John Clark remembering his past missions as he is about to retire.
- Mario Party: The Top 100 remasters one hundred minigames from the previous numbered installments of the seriesnote , and also brings back the Minigame Island from the first game.
- Downplayed with Kirby Star Allies. The main game is mostly new content sans the usual returning bosses, but free updates added new "Dream Friends", letting you play as characters from other installments, including Marx and Adeleine, with most of them being playable for the first time here. Playing as these characters in the speedrun-style "Guest Star" mode will revamp several of the levels to be recreations of stages from their original games.
- Super Mario Bros. 3Mix is a ROM Hack of Super Mario Bros. 3 in which each world is based on on a different Mario platformer, recreating levels and boss fights from them and importing mechanics not seen in vanilla 3, such as Yoshi, Chucksters, and alternate gravity.
- Super Mario Maker is the Level Editor equivalent of a Megamix Game. It features graphic sets based on Super Mario Bros., Super Mario Bros. 3, Super Mario World, and New Super Mario Bros., and each set comes with unique power-ups, enemies, and obstacles taken from the respective games as well as new mechanics. There's plenty of references to Mario Paint incorporated into the editor, and many Super Mario Bros. characters (and many not from the franchise) are present as Mystery Mushroom costumes.
- The fan game Mega Maker follows in the footsteps of Super Mario Maker by packing elements from all of the Mega Man (Classic) titles into a Level Editor-based game.
- While Rockman 4 Minus Infinity is first and foremost a revamping of Mega Man 4, many of its enemies, bosses, and elements are taken from other Mega Man titles, such as Skull Man's stage including a bunch of gimmick platforms from various stages (like Guts Man's rail platforms), Shadow Man being a Recurring Boss, and Terra showing up in the final Cossack stage complete with his Spark Chaser as a temporary weapon.
- This trope is practically the whole premise behind the Sonic the Hedgehog nostalgia bomb known as Sonic Mania. Most of the Zones are remakes of those from the original Genesis trilogy (plus Sonic CD), and many major and minor details are taken from them and other early Sonic games (see the game's Mythology Gag subpage). Apt for a Milestone Celebration.
- Before Sonic Mania came Sonic Generations; with the exception of the final boss, every single level and boss was taken from past Sonic games. Apt for... another Milestone Celebration.
- Crash Team Racing: Nitro-Fueled. Though it's primarily a remake of the original Crash Team Racing, it also includes content from Crash Nitro Kart (namely characters, karts and tracks) and Crash Tag Team Racing (mostly karts and costumes).
- Ridge Racers consist exclusively tracks from the PS1 installments of the series and the arcade-exclusive Rave Racer, and feature many rearrangements of songs from those titles. Ridge Racers 2 escalates this to including every tracks from every PS1 installment and also has intro movies and E3 trailers for the previous games as unlockables.
- Rhythm Heaven Megamix is the Trope Namer, including rhythm games from all three previous entries in the series, plus several new ones.
- Guitar Hero: Smash Hits consists of songs from previous titles, with multiple improvements:
- All songs have playable bass, vocal, and drum parts. The first GH only had guitar parts, and games prior to World Tour lacked drums and vocals.
- The original versions are used, while older titles often used Cover Versions to save on licensing fees.
- Finally, the game is available on Wii, Xbox 360, and PlayStation 3. Games prior to Guitar Hero III (excluding II) were exclusive to PlayStation 2, so this is the first time owners of these systems could play some of the songs.
- DJMAX series:
- DJMAX Trilogy is the first such effort at such a game, featuring tracks from DJMAX Online, DJMAX Portable, and DJMAX Portable 2. Updates also added tracks from DJMAX Portable Clazziquai Edition and DJMAX Portable Black Square.
- DJMAX Respect goes further, adding tracks from more DJMAX games and, in particular, not only having tracks from DJMAX Technika but also the gameplay as part of a DLC pack.
- Etrian Odyssey Nexus is the culmination of the series. It brings back classes and dungeons from all five previous titles, although it also features a few new dungeons and a new class.
- Monster Hunter Generations features monsters, locales, villages, and NPCs from past Monster Hunter games, alongside a few new ones. Monster Hunter Generations Ultimate, the Updated Re-release, adds more old stuff to the mix.
- Mario & Luigi: Dream Team seems to have had this trope in mind. In particular, certain Bros. moves and NPC races are taken from Mario & Luigi: Superstar Saga, and several gameplay mechanics (e.g. the 2D/3D Dual-World Gameplay and the turn-your-system-sideways giant boss battles) are taken from Mario & Luigi: Bowser's Inside Story; on top of that, there are several NPC cameos from all three previous games.
Shoot 'Em Ups
- Sonic Wings Special and its arcade counterpart Sonic Wings Limited mix-and-match level themes and boss battles from the three previous games. Of the 10 or so player characters and levels featured in both games, only one of the player character and one of the boss are brand new.
- DoDonPachi Maximum features stages, bosses, and player ships from DoDonpachi dai ou jou, DoDonPachi DaiFukkatsu, and Ketsui.
- Ace Combat Infinity consisted primarily of remakes of past missions and boss battles (primarily from the Playstation 2 installment of the series) transposed to a real world setting and Free to Play progression system. The Special Events also played up the celebration aspect, often handing out skins and emblems based on the previous games.
- WarioWare Gold does this for its series on a grand scale. Not only are its three major control schemes taken from the original, Twisted, and Touched, but a large number of the microgames are remakes of microgames from those titles, DIY, and Smooth Moves. Even certain challenge modes, such as the Gamer mode from Game & Wario (now known as Sneaky Gamer) and the WarioWatch from Twisted, made it in! Small wonder that the game got the Fan Nickname "WarioWare Megamix", especially since the game is from the creators of the above Rhythm Heaven Megamix.
- Katamari Forever, while having a decent amount of new levels, also features a hefty amount of returning fan-favorite levels and remixes of fan-favorite songs from the previous Katamari games.