A device called Action Replay DS is available at Target and WalMart. It's like a DS card. You insert it inside the DS and search for NSMB, then the cheats come up. Some of them are infinite jumps, infinite lives, all worlds unlocked, and invincibility. For more information, visit http://en.wikipedia.org/wiki/Action_Replay_DS. If you can't find Action Replay DS, then sorry! Hope this helped!