Knuckles in Sonic the Hedgehog is a fan-made ROM of the game Sonic the Hedgehog for the Sega Mega Drive/Genesis, featuring the character Knuckles the Echidna in place of Sonic the Hedgehog, the game's usual protagonist. The history of the game begins with the release of the Mega Drive game Sonic & Knuckles. The unique cartridge featured "Lock-On Technology" and allowed players that also owned the game Sonic the Hedgehog 2 to link the two together and play the game through as Knuckles instead of Sonic. However, partly because of a poorly matching colour palette, no such feature was included in the first Sonic game (instead, attaching Sonic 1 to the Sonic & Knuckles cartridge unlocked the full version of Blue Sphere). In the ROM hacking community, creating a patch that allowed the gamer to play as Knuckles in Sonic the Hedgehog was considered the "Holy Grail of ROM Hacking." On September 1, 2005, Stealth created a hack that allowed a player to do just that. His hack was called Knuckles the Echidna in Sonic the Hedgehog (Knuckles in Sonic 1, or S1K for short) Knuckles in Sonic 1 one gives Knuckles all the moves he has in Sonic and Knuckles, including gliding, wall climbing, and the spin dash. Not only that, Knuckles can transform into his Super form once he obtains all the emeralds (a cheat must first be enabled).

Mega Lo Mania is a real-time strategy computer game developed by Sensible Software. It was released for the Amiga in 1991, and ported for a variety of other platforms. It was released as Tyrants: Fight Through Time in North America.

Metal Sonic Hyperdrive is a heavy modification of Sonic the Hedgehog by Darkon360/GothicReaper/LoneDevil for the Sega Genesis. with brand new Zones, New Music, Extra playable characters, and Modes. Starting Metal Sonic, taking Sonic's role as the main protagonist to stop Dr'Robotnik's greatest inventions yet. Also starting special guests such as Kirby, and Somari.

Metal Sonic in Sonic the Hedgehog is a hack of Sonic the Hedgehog created by Darkon360/GothicReaper/LoneDevil. It stars Metal Sonic as the playable character instead of Sonic the Hedgehog. The game is modified to use Metal Sonic's sprites in place of Sonic's. The hack comes with 4 different play styles: The Original, Sonic 2Spindash, Sonic CD, and Sonic CD 2011.

Metal Sonic in Sonic the Hedgehog 2 is a hack of Sonic the Hedgehog 2 created by Darkon360/GothicReaper/LoneDevil. It stars Metal Sonic as the playable character instead of Sonic the Hedgehog. The hack comes with 3 different playstyles for Metal Sonic.

Mickey Mania: The Timeless Adventures of Mickey Mouse is a 1994 platformer video game developed by Traveller's Tales and published by Sony Imagesoft for Sega Mega Drive/Genesis, Mega CD, and Super NES. In the game, the player controls Mickey Mouse, who must navigate through various side-scrolling levels, each designed and based from classical Mickey Mouse cartoons from 1928 to 1990. The game was later released on PlayStation in Europe and Australia as Mickey's Wild Adventure and was later released in Europe and Australia on the PlayStation Store on July 10, 2012. The box stated that Mickey Mania was the first video game to feature animations by real Disney animators. This is also known as the first game that video game designer David Jaffe worked on.

Midnight Resistance (ミッドナイトレジスタンス, Middonaito Rejisutansu?) is a side-scrolling action shooting game produced by Data East for the arcades in 1989. The game was ported by Data East to the Sega Mega Drive in 1990 and by Ocean Software to various home computer platforms during the same year. The game is set in a dystopian future where the player controls a member of a resistance movement who goes on a mission to rescue his kidnapped family from a mad scientist.