Head left with the spikes after the checkpoint and you'll come across the World Bowser-1 Stamp.
Ride Plessie between the two Bowser sculptures into what seems to be certain death. There are actually invisible cloud platforms beneath you, allowing you to collect the World Bowser-2 Stamp.
Defeat the row of marching spike ants and drop down in the hole they emerge from to collect the World Bowser-3 Stamp.
World Bowser-Train Stamp is on the roof of one of the cars. Use a Super Bell to scale up the side or pound the ? block that extends to the top.
The World Bowser-4 Stamp is on a glowing platform near the end of the level. Take a leap of faith to the right to collect your prize.
Float to the top left of the water in the room with three large spikes near the beginning of the level to grab the World Bowser-5 Stamp.
You'll need Luigi to collect the World Bowser-6 Stamp. Hop off the moving platform onto the button and it will appear.
World Bowser-7 Stamp is above a Hammer Bro on a platform shortly after the checkpoint flag.
The World Bowser-Castle Stamp is hiding on top of a tree at the end of the level, as your reward for defeating Meowser.
Walk inside to collect the World Bowser-Tent Stamp.
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