Bowser's Keep
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http://www.kingbowser.com/
Koopa's Koopaling Castle
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http://members.tripod.com/~kookykoopa/
Waluigi's Throne
Waluigi's Throne
http://www.waluigisthrone.vze.com/
Wario Land 4
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http://www.gamespot.com/gba/action/warioland4/review.html
Wario World
Wario World
http://www.wario-world.com/