Star Soldier1986

Homebrew version of Mega Man 2 for TurboGrafx 16/PC Engine

Super Contra X is a pirate based off the Contra series, created by Chengdu Tai Jing Da Dong Computer Co sometime in the 1990's (likely in 1994).

Released in 1997 on Family Computer, by Super Game.

Contra Spirits, also known as Super Contra 3, is a pirated Famicom port of Contra III: The Alien Wars (Contra Spirits in Japan and Super Probotector: Alien Rebels in Europe) for the SNES, made by Ei-How Yang (and possibly others) in 1995. It was only released in 1997.

Earthworm Jim 2 (蚯蚓吉姆2) is an unlicensed port of the game of the same name, made for the Famicom by a team of (or at least related to) Ex-Sachen developers and published by Ka Sheng in 1996.

Released on Sega Mega Drive/Genesis, by Gamtec.

Released in 2000 on Game Boy Color, by Makon Soft.

Halo 2600 is an action-adventure video game developed for the Atari 2600 video game console, inspired by the Halo series of video games. Halo 2600 was written by Ed Fries, former vice president of game publishing at Microsoft, who was involved in Microsoft's acquisition of Halo developers Bungie Studios. Fries decided to create a version of Halo for the Atari 2600 after being inspired by a book called Racing the Beam: The Atari Video Computer System by Ian Bogost and Nick Montfort. The Atari 2600 had such limited RAM, only 128 bytes, that drawing Master Chief was difficult, and creating a game with other characters was even more so. Fries later stated that making the game taught him that constraint is sometimes a fuel for creativity.