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- Star Coin 1: At the very start of the level, the first Star Coin is in a hidden area in the left wall.
- Star Coin 2: Similar to the first Star Coin, the second Star Coin is in a hidden area in the wall to the left of the four parallel poles.
- Star Coin 3: Mario and co. must follow the path to the secret exit. While on the falling platform, about halfway down on the right is a hidden area that contains the third Star Coin.
Upon seeing the first yellow moving platform in the third room where the player is climbing ropes on the ceiling, they should stop and wait until it moves away. The player should then fall, landing on a hidden platform with a door. When they go into this, they will discover a platform slowly descending, with countless Boos floating around. If the player survives, a door is seen. This exit unlocks the World 3-Cannon, taking the player to World 6.