Start off by claiming the coins around the area and using the pipe at the back end to reach a cliff. If you have the Cat Power-Up simply climb this wall to Green Star #1 but if you don’t, hop down to a block with a Super Bell first.
To the right of the starting area is a Mario Character Switch that must be pressed by Mario in order to reveal the Stamp so obviously if you are not Mario this switch will not work and you’ll need to replay the level with Mario.
Head through the pipe leading right and go under the far hill for a 1-Up Mushroom before going through the Red Ring. Collect all eight Red Coins quickly and you’ll get a Super Bell. If you climb the tall left and right ledges you can get some coins to appear, but otherwise continue to the far north and down the pipe.
Once underground you’ll want to take the top path to find a Super Bell – you need the Cat Power-Up. At the end of the floor jump up and climb the wall to a bunch of coins then drop down to a pipe that leads to Green Star #2 which is collected by lighting up the entire floor (there isn’t a time limit!).
Head back out and don’t be fearful of falling, instead willingly do so to find a bunch of coin blocks and Green Star #3 then use the pipe to head back to the top. Use this final pipe to reach the final area with the Goal Pole.