Rockman & Forte: Challenger from the Future on my WonderSwan Color

http://megaman.wikia.com/wiki/Rockman_%26_Forte:_Mirai_Kara_no_Chousensha

I play the game on my WonderSwan Color, although this game works for the regular WonderSwan, too.

The WonderSwan has a contrast slider and can be played horizontally or vertically (depending on the game play; the system will notify you when to change)

https://en.wikipedia.org/wiki/WonderSwan