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''Robotnik's Revenge'' is a [[GameMod ROM hack]] of ''VideoGame/SonicTheHedgehog2'' by [=Colinc10=]. Instead of replacing the levels from the original game, it instead takes the final level and extends it greatly, adding all 17 bosses from ''[[VideoGame/SonicTheHedgehog1 Sonic 1]]'' and ''2'' into one giant boss run.

There are two modes in the game: Time Attack, which gives Sonic infinite lives, has rings within the level, and gives you a grade based on your time, and Survival, which gives Sonic 3 lives, no rings, and simply sees how long you can hold out. Players can also choose between Sonic and Tails, though the difference is minimal.

The game was very well-received at the Sonic Hacking Contest, and even had a trophy named after it.
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!!This game provides examples of:
* AntagonistTitle: Referring to Robotnik/Eggman, who is the primary opponent fought in this hack.
* BossGame: While there are a few short platforming segments between boss fights, most of the time the player is going to be fighting bosses.
* BossRush: The game takes place in a vastly expanded Death Egg Zone featuring all of the bosses from ''VideoGame/SonicTheHedgehog1'' and ''VideoGame/SonicTheHedgehog2''
* EndGameResultsScreen: At the end of Time Attack mode, the game gives you a letter grade based on your time.
* MarathonLevel: The entire game is one long level with '''17''' bosses.
* NoPlotNoProblem: The only indication of any plot happening is in the game's title, with Sonic 2's ending cutscene being replaced with an EndGameResultsScreen.
* OneHitPointWonder: Sonic is made this in Survival mode, since there are no rings.