Plot: Hammerin' Harry, known in Japan as Daiku no Gen-san, is a series of platforming video games developed and published by Irem in 1990. The titles were developed and published for the arcades, Famicom, Game Boy, Super Famicom and Sony PSP platforms. Wikipedia
Plot: Hammerin' Hero, known in Japan as Ikuze! Gen-San: Yuuyake Daiku Monogatari and in Europe as GenSan, is a 2008 platform video game for the PlayStation Portable handheld. It is the eighth and most recent game in the Hammerin' Harry series excluding spin-offs. Wikipedia
Plot: Battle Rush: Build Up Robot Tournament is a Japan-exclusive video game for the Nintendo Family Computer. The game was one of six that required Bandai's Datach System in order to operate. Wikipedia