Major Lives Bank
Head to world 2-3. When you get to the yellow block pyramids with the fire caterpillars, on the top of one of of the pyramids is a secret tunnel to the left. Go into it and you'll notice a bunch of spiky shell creatures on some bricks. If you have a teammate, do the groundpound (jump and down on the d-pad) at the same time. All creatures should die and you should get 6 lives from it. Continue as many times as desired.
More tricks, tips and cheats for this game are right here - New Super Mario Bros cheats
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