Welcome to the BANDAI section here at SoreThumb Retro Games. We stock a large selection of games, accessories and systems. WonderSwan was a line of handheld game consoles produced in Japan by Bandai between 1999 and 2003. It was developed by the late Gunpei Yokoi's company Koto and Bandai. The WonderSwan was made to compete with the Neo Geo Pocket Color and the market leader Nintendo's Game Boy Color (even though the developer for the WonderSwan, Gunpei Yokoi, developed the original Nintendo Game Boy).