As you approach Point 1, the Blocks swivel down toward the lava. Position the raft under the Blocks, then use them to reach the Star Coin high above you.
Hit the ? Block at Point 2 to reveal a Springboard. Hop up and grab it, then drop back to the raft. This valuable tool allows you to reach some important items, so try to keep it until you reach the end of the level.
When you reach the coin outlines at Point 3, bounce on the Springboard to prevent the raft from moving. Watch for the Star Coin that swings through the area, then jump up and grab it.
Bounce up to the Red Ring at Point 4, then drop back down to the raft. After the Springboard passes under the first set of Blocks, pick it up and collect the red coins to the right. When you reach the last group of red coins, use the Springboard to collect them.
The last Star Coin is located in a hidden area. Use the Springboard to reach the red pipe at Point 5.
After you pass through the pipe, activate as many of the coin outlines as you can, but try not to collect the coins that appear. Hit the Block along the left wall to reveal a P Switch, then stomp it to transform all of the coins to Blocks. Use the Blocks to reach the Star Coin at the top of the room.
During the boss battle, a Chain Chomp pulls Larry Koopa around the room. Avoid the Chain Chomp and use the platforms to stomp on Larry’s head.
Larry uses his wand to shoot fireballs around the room. Dodge these attacks and position yourself to stomp him again. Jump on Larry Koopa three times to end the encounter and unlock World Three.