You’ll need a Cat Suit to collect most of the items in this level, but you also pick up a few Super Bells along the way, so make sure you get them. The purple liquid here acts like lava in other levels, so avoid touching it at all costs, as you will lose a life instantly. The stage will start with you on a platform, and a large wooden raft coming out from under it, moving forward. Jump on it, then quickly hit the nearby ?-Block to get a power-up (Super Bell). If you do have the Super Bell, then you can use it to climb the cage and get on top of the level for a bit.
If you don’t climb up there, you get another opportunity with the moving red fence just ahead. While up here, you need to watch out for the Fire Piranha Plants. If you take the low road, you can find a Red Ring near a Piranha Creeper, which will result in getting a Super Bell if you collect all the coins in time. Right after that landmass with the Red Ring, you can climb the next fence to find the Stamp on top of it. As soon as you do, and with the raft below you, drop down and take the clear pipe to collect Green Star #1. Just make sure you have a platform on the other side before going through the clear pipe.
Just past that will be the Checkpoint Flag, as well as more stuff to climb right after that. Do climb it to find a Green Star Ring, then quickly collect all of the coins to earn Green Star #2. Note that some of them are on moving platforms, so be careful in getting those ones. Hop back on the raft and skirt by all of the Piranha Creepers, before getting on the raft once more. The raft will drop down a “waterfall” and you will see a Warp Box right at the end. Ignore it, though, and quickly climb the wall behind it to find Green Star #3. Take the Warp Box now to enter the Goal Pole area and finish the level.