If you have a Super Bell in your pocket, then that will make this level a lot easier, although that will also be the main power-up for this stage. Jump up through the cloud platforms and on the next tier, you will find a power-up in one of the ?-Blocks near the Galoomba. Continue climbing up, avoiding the Bill Blasters as you reach another Jump Panel, with there being an invisible ?-Block to the right of the visible one, yielding a power-up. As you keep ascending, stick towards the left side and avoid going in the Warp Box, if you happen to see it. You can use the conveyors along the wall to make your ascent a little easier, with there being Green Star #1 at the very top.
Jump down to the level to your right and break the crates to find a hidden Super Mushroom, then use the Warp Box next to the Sprixie Princess. Touch the Checkpoint Flag, then climb up the wall after grabbing the power-up from the ?-Blocks. Hop into the Mystery Box, then quickly circle around the platform using the Cat Suit to obtain Green Star #2. Cross the platform, past the Bill Blasters and to a few cloud platforms going in and out of the wall. To the left of the cloud platforms is an invisible ?-Block and if you climb the middle of the wall to the top, you will find another hidden block with a 1-Up Mushroom. Start ascending the tower here, using the cloud platforms, until you reach a mess of conveyors.
Some of these are going down, but one will be going upwards. Take this one to a cloud platform, then ride the one heading right to a platform with Green Star #3. Ride the conveyor there to the top, but ignore the Goal Pole to your right. Instead, opt to go left and climb the wall at the end to spot some bricks. Do not break these, as you should notice a shadow on top of the bricks, so hop on top of them to spy the Stamp. You can now head to the Goal Pole to complete the level.