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[Title] Klonoa: Midnight Museum [Genre] Platformer [Description] 
A decent entry in the Klonoa series. Unfortunately it's pretty easy, and there's NO BOSSES. Still, if you want some double-jumping and wind-bullets for your Wonderswan, here ya go. This is pretty much the basis for the GBA platformers though, which ended up addressing the few problems with this.
WonderSwan - /v/'s Recommended Games Wiki