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Below are some lists that you can download to help you decide what which games you might want. There is a lot of info in the spreadsheets, and they will be updated periodically.
List of black and white games for the original Wonderswan. All of these games are playable on all versions of the Wonderswan. The list will be updated with new info periodically.
Wonderswan Color Games
List of games for the Wonderswan Color and Crystal. Most of these games are not compatible with the original Wonderswans. but ones that are are marked as such. I will update with new info periodically.