Madden NFL 2006 - Platform: Nintendo DS

Bonus Madden Card Set:
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Have the Game Boy Advance games Madden NFL 2005 or Madden NFL 06 in 
the cartridge slot. Go to 'Madden Cards'. The game will detect the 
Game Boy Advance game, and you can buy a bonus set of Madden Cards.

High stepping into endzone:
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While you are running far out in front of everybody and are near the 
endzone, hold X and your player will high step all the way into the endzone.