Slow down, speedy! Before rushing across this spinning mound of earth, wait until the rotating mound reveals a pipe. Slide down the pipe to find an underground cavern with a P Switch and a small cache of riches.
Don’t forget to grab the hidden 1-Up Mushroom inside a small alcove as you emerge from the underground cavern holding the second Star Coin. Before you exit to the right, out of the alcove, look up to find a Block. Jump up to hit the bricks and collect your 1-Up Mushroom!
If you don’t go down the pipe, stay on top of it and you’ll find a hidden area with three 1-Up Mushrooms and a lot of coins!