Only launched in Japan, the WonderSwan was Gunpei Yokoi's next system after designing the Virtual Kid for Nintendo (he likewise produced the Game Kid system and the Metroid series). The initial WonderSwan features a monochrome display and was developed to be played either vertically or horizontally. Games differed on this element, with a large variety of games. Plus it works on just one AA battery!
Black & White/Monochrome Display
Vertical or Horizontal Screen Play when Rotated
Games Feature Amazing Crisp Graphics
Clear Pink Case ~ Only Released in Japan