Super Mario 3D World Stamps: World 4
The fourth World in Super Mario 3D World has seven Stamps to collect.
World 4-1: Ant Trooper Hill
This level's Stamp can be found floating above a square surrounded by ants. You can kill them with your cat powers and clear a path, or use the Star hidden in the blocks just past the square.
World 4-2: Piranha Creeper Creek
Just past the Checkpoint flag, you'll come across a Piranna Plant guarding a small body of water. Use its head as a platform and bounce your way above it to an area with a Stamp.
World 4-3: Beep Block Skyway
Right next to the Checkpoint flag, you'll see a platform with the number "4" on it. You can either use a Double Cherry or grab three other players and use the platform or use a Cat Suit and climb to it.
World 4-4: Big Bounce Byway
On the final, large bounce platform, dodge all of the enemies and grab the Stamp amidst the chaos.
World 4-5: Spike's Lost City
After the first ramp with Spike's spike logs, use the Cat Suit to climb up the wall, and follow it back to the start of the level. You'll find a Stamp at the end.
World 4- Boss: Lava Rock Lair
This Stamp requires a Cat Suit to grab, so come prepared. Just before the final bridge, climb up the left wall to a landing, and then climb higher to find the Stamp.
World 4: Stamp House
Jump down the Warp Pipe in the southernmost area of the map to find the Stamp House.
