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: Shuyaku Sentai Irem Fighter is a 1993 strategy video game developed and published by Irem exclusively in Japan for the Nintendo Game Boy on July 30, 1993. It features characters from four of Irem's franchises: R-Type, Mr. Heli, Ninja Spirit, and Hammerin' Harry. Wikipedia