If you mean the warp pipe, then after you've obtained the Super Boots (found at Boo's Mansion) you can break through the wooden floor panel in the Toad Town Sewers (it's right there when you go underground). Then go through the doorway to your left, defeat the Dizzy Koopas, and it will appear.
You go up to it and shake it. It should open and Mario's hat should pop out.
go up to it and press a
Flip once you're on the left side of the platform above the block with the vase in Merlee's Mansion (2-3). There, you wil see a treasure chest. Open it to find the third pixl (Slim.)
press c left to open the item menu
open a door with a lock in the area you obtaned the key in
Flip in the room with red and blue things and you will see a pipe. Go in that pipe open the treasure chest open it to get it. But you will have to throw a block at a blue block to get out. Anymore questions about Super Paper Mario ask me :)
He is always hidden. Keep your eyes open. Try clicking on every bush you see.
the war is still going on but you can fight the boos and open the reward shop
In both dugeons you use... BOMBETTE,. if it is the first dungeon talk to the small pink bob-omb.
The first game that featured Mario was "Donkey Kong" (1981), although he was referred to as "Jumpman".
To unlock the Luigi's Mansion stadium in Mario Super Sluggers, you need to complete the "Challenge Mode" by defeating all the bosses. After defeating King Boo, you will gain access to the stadium. Additionally, you can also unlock it by playing through the game and collecting enough stars to fulfill the requirements. Once unlocked, it becomes available for play in exhibition matches.
You open doors with the head things