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.
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