From the Super Mario Wiki
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The player starts out on a wooden platform with two ? Blocks next to them, the one on the left contains multiple Coins, whilst the one on the right contains a Poison Mushroom. The player will continue up the wooden platform avoiding Spikes and Bob-ombs. The player will then jump onto the next wooden platform which has a launcher that fires Banzai Bills. The player will then jump onto another wooden platform that has a Spiked Ball launcher and a Red Ring that will spawn five Red Coins, if the player collects them all in time they will receive either a power-up or a 1-Up Mushroom. The player will continue up some more wooden platforms whilst avoiding Spiked Balls, they will then reach a large platform that contains the Checkpoint Flag. The player will then jump down onto another platform where there are several Bob-ombs and a Koopa Shell, the player can use the Koopa Shell and get a 1-Up. The player will then cross a long wooden platform that has various Donut Lifts, Spike Platforms and Banzai Bills. After this, the player will reach an Airship that has a Warp Box that warps the player to the final area. On the bow of the Airship in the final area there is a fake 1-Up Mushroom sign, if it is destroyed it will yield a 1-Up Mushroom. The player will then have to jump up three stairs that have some Spikes on them before reaching the Goal Pole.