World 1-2: Unlimited Lives
When you enter the pipe at the start of the level you will come to a wall you can climb. At the top of the wall you will find a turtle and a power-up block. If you smash through the two purple blocks on the ground using a butt stomp you will find another turtle there. Stomp on that turtle without hitting it's shell and walk off from the left onto the shell. If you manage to do this correctly it will break the blocks then bounce back and forth giving you unlimited lives.
More tricks, tips and cheats for this game are right here - Super Mario 3D World cheats
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