New Super Mario Bros.: 4-5

We take a pipe to go underground. We land on a mushroom and find the path blocked by some stone blocks shaped like stairs. Above them is a pipe with an endless supply of Bob-ombs so you can blow up the blocks. We'll be doing a lot of that here. We pass the midpoint without finding any Star Coins. The first Star Coin is encased in stone blocks, so have a Bob-omb destroy the blocks so you can reach it. Be careful not to blow up too much of the floor. Next is a series of drawbridges. The second Star Coin is surrounded by brick blocks above the second drawbridge, so hit the brick block under the Bob-omb walking around, and let it explode some blocks. Then use the drawbridge as a ramp and jump up through the gap to get it. Under one of the later drawbridges is a pipe covered with stone blocks. Carefully drop a Bob-omb down there, then enter the pipe. It will take you to the third Star Coin. In the last part of the level, there will be Spinies crawling on the ceiling, so watch out for them. At the end is a pipe to the flagpole, which opens the way to 4-6.