Defend Your Castle (Wii)
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Display the credits, then select the text "SMB3W4" when it appears. This is an abbreviation of Super Mario Bros. 3 World 4, and refers to the fact that all enemies were giant-sized in that part of the game.
Display the credits, then select the text "Chuck Norris" when it appears.
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Catapults Only mode
Display the credits, then select the text "IM IN UR CONSOLZ DFENDIN UR CASLEZ" when it appears.
Press Plus to pause game play. The in-game time continues to pass. After the sun is gone for awhile, resume the game to complete the level.
Strategy guides from GameFAQs