The primary concern for this level is the alternating series of blue and pink Beep Blocks. They will tick several times before a beep indicates that one set of blocks will disappear and the other appear. On top of that, you have to use Double Cherries to create clones to reach all of the collectibles. For example, two P Panels early into the level cause Coins to appear.
Green Star #1
The first Green Star is guarded by the dual threat of Beep Blocks that can drop you into the abyss at any moment, and a pair of Boomerang Bros. Don’t take unnecessary risks while trying to get the Green Star or fight the Bros. Use the railings on some of the permanent platforms to protect against ranged attacks if possible, and carefully time your runs across the Beep Blocks. Take the Warp Box out of there once you’re done.
The area beyond the Warp Box is protected by another Boomerang Bro, and a stairway made of alternating Beep Blocks (4). You must preserve at least four Double Cherry clones as you make your way to the Checkpoint Flag.
Stamp
Next to the Checkpoint Flag is a Multi-Vator that requires four players or Double Cherry clones to stand on it. This will take you up to the Stamp. Continue down the next set of Beep Blocks to reach another Warp Box.
Green Star #2
The area past the second Warp Box contains two Boomerang Bros. protecting a raised platform with a pipe. The pipe takes you to a bonus room where hitting a P Switch will cause Blue Coins to fill the room. If you’ve got multiple Double Cherry clones, you can easily snap up the Coins and collect the second Green Star.
This long slide made entirely of Beep Blocks can be quite tough during your first run, and if you’re trying to preserve Double Cherry clones, you can expect to lose a few before you reach safety. It helps if you can keep the clones sliding in single file, but they may not all cooperate.
Green Star #3
Get the last Green Star by having two characters or Double Cherry clones stand on Switch Panels at the bottom of the long slide. Getting the clones there, however, is not the easiest task. Here, we opted to bring Luigi to give us a hand.
The Goal Pole has two Boomerang Bros. and a set of Beep Blocks acting as the stairs leading up to it. Deal with the Bros. before making the last set of jumps!