The WonderSwan is a handheld game console released in Japan by Bandai. Developed in collaboration with Gunpei Yokoi's company Koto Laboratory, it was the final piece of hardware Yokoi worked on before his death in 1997. Launched in Japan in March 1999 during the sixth generation of video game consoles, the WonderSwan was followed by two upgraded models, the WonderSwan Color and SwanCrystal, before Bandai discontinued the line in 2003. Throughout its lifespan, no version of the WonderSwan was officially released outside Japan.