Wario World/Microgames
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Once all Treasures in a stage have been collected, access to one of eight Microgames collections from WarioWare, Inc.: Mega Microgame$! become available to play via Game Boy Advance Link Cable. Each collection gives four failures before the demo ends.
Some microgames available include: Repellion, Wario Whirled, Butterfingers, and Munch a Bunch.
