World 4 contains a single Stamp to collect in every level.
In the first cave you enter, the Stamp can be found surrounded by any enemies. You’ll need a way to take them out before getting to the Stamp.
Before you jump into the water, jump over the water and use the Piranha Plant as a boost to enter the hole on the right. Run all the way to the right to find the Stamp.
Double Cherry required! Behind the Checkpoint flag is a lift that requires three characters to move. The lift will take you to the Stamp above.
You will come across a large group of Para-Biddybuds while bouncing on the large mushroom. The Stamp is in the center of the enemies.
Super Bell required! To the left of the green warp pipe near the start of the level is a tall. Climb up to the top from the right side and walk all the way to the left to find the Stamp.
Super Bell required! Before you pass through the two walls, climb up the left wall in your Cat form. The Stamp can be found at the top.
Enter the tent to find a Stamp free of charge!