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WarioWare: D.I.Y. Showcase is a standalone product exclusive to
the WiiWare service and available only from the Wii Shop Channel. The
game contains more than 70 new microgames and features interoperability
with theWarioWare:
D.I.Y. game for the Nintendo DS family of products. Players that own
both games can transfer content between the two via a local wireless
connection, and can even play user-created microgames on their
television using WarioWare: D.I.Y. Showcase.

What is the Wii Shop Channel?