We have 30 seconds to complete this challenge, whichh means we need clocks. We collect a few in the water and go through the green pipe. We find the first Star Coin near the first Blooper we see. We get out of the water and dive back in. The second Star Coin is next to a grate near the eel. Past the eel is the green pipe on land, as well as the third Star Coin. Wall jump off the stone to get it. The green pipe takes you to the flagpole, where I got a 1-up.