Puyo Pop Fever (ぷよぷよフィーバー, Puyopuyo Fībā) is a puzzle video game developed by Sonic Team. It is the fifth main installment in the Puyo Puyo puzzle game series and the second Puyo Puyo game to be programmed by Sonic Team after Puyo Pop (which was released just after the series' original developer, Compile, went bankrupt). This was the start of the "reboot" series of the Puyo Pop franchise, with a new plot discussing how Accord lost the flying cane. Sega, which acquired the series' rights from Compile in 1998, published all the Japanese versions of the game. The game was scarcely released internationally, and certain versions were released by other publishers in those areas. Only the Nintendo GameCube and DS versions were released in North America. Europe received both versions plus the Xbox, PlayStation 2, Game Boy Advance, and PlayStation Portable versions. The NAOMI port to Dreamcast, released exclusively for the Japanese arcade cabinets, was the last Dreamcast game developed by Sonic Team, as well as the last first-party title released on the platform. The Dreamcast version is the only console version to use sprites in place of 3D models.

Heavy Unit (ヘビーユニット, Hebii Yunitto) is a side scrolling shoot-em-up arcade game developed by Kaneko and published by Taito in 1988. It was ported to the PC Engine by Taito and was released on December 22, 1989. There was also a Mega Drive port by Toho entitled "Heavy Unit: Mega Drive Special" released on December 26, 1990. The player takes control of a star ship that can transform into a mecha by obtaining a specific type of power up.