Toad Town Tunnels
The Toad Town Tunnels (or sometimes simply "Toad Town Tunnels", as Goombario sometimes use the article "the" and sometimes not) are the sewer system beneath Toad Town in Paper Mario. They are a massive series of passages with Warp Pipes and Blue Pipes that connect to all major areas of the game, with the exception of Shy Guy's Toy Box and Flower Fields, both of which are accessed directly from Toad Town. The main pipe to the tunnels is in the area of Toad Town with Tayce T.'s house and the entrance to Forever Forest. The secondary entrance/exit is in the blue house to the north of the main entrance. Mario is required to go here to get the Ultra Boots and go to Shiver City in order to start Chapter 7 of Paper Mario, but going to other areas of the tunnels is optional. All pipes to other places are "shortcuts" and are not accessible before visiting that place.
Much like Rogueport Sewers from Paper Mario: The Thousand-Year Door, the Toad Town Tunnels have few areas available at the start of the game. The more upgrading items, powers and party members Mario have, the more areas of the sewer Mario can travel to.
Three Blooper fights occur here, and many Badges, Star Pieces, and Super Blocks are scattered around the area. The salesman Rip Cheato can be found at the second entrance/exit. The in-game map description reads, "The system of tunnels runs under Toad Town. There are many pipes inside-- some of them are shortcuts."
In the south part of Toad Town, there is a pipe to the southwest of the crossing. The area is marked "Private" on a notice board nearby. By going through the pipe, Mario reaches the "entrance" area of the Toad Town Tunnels. There is a path east, a path west, and a wooden floor on the ground.
Area east of entrance
At the beginning of the game, Mario and his partners can only go east. There is a gap with a wide pipe as a bridge. Then comes a Save Block. Mario can smash the Yellow Block at the door to proceed. In the next room is a Gloomba as well as a line of brick blocks, some of which contain coins. One brick block has a Spiked Gloomba lying on it. There is an invisible block among them containing a Super Shroom. In the final room, there is again a gap with a wide pipe as a bridge. After crossing the bridge, there will be a Blooper guarding the Treasure Chest to fight Mario. After defeating the Blooper, Mario can get the Shrink Stomp badge in the treasure chest.
Area west of entrance
After getting the Super Hammer from Dry Dry Ruins in Chapter 2, Mario can smash the Stone Block blocking the door and go to the room to the west. In the first room is a Blooper fight, after which an ! Switch drops which will unlock the shortcut pipes to Goomba Village (Prologue), Koopa Village (Chapter 1), and Dry Dry Outpost (Chapter 2). In the second room, Mario encounters three ? Blocks first (the middle one containing a Snowman Doll), platforms that go up, and finally a pipe leading to a new area beneath. To the left of the new area are two Spiked Gloombas hanging around, a brick block with a trampoline above it, and the Power Smash badge in a high treasure chest. To the right of the new area is a gap with two platforms that form a seesaw, and a door with two Spiked Gloombas across the gap. In the next room there are gaps in the higher place, at the end of which is a Star Piece. Mario can take the platforms that go up in the room to these high areas as well as to the ceilings where he can find another room with a Super Block. There are Paragloombas here. Finally, in the southeast of the new area is a pipe leading to a room with a Buzzy Beetle, two Metal Blocks, and another Super Block.
Area beneath the entrance
After getting the Super Boots from Boo's Mansion in Chapter 3, Mario can break the wooden floor in the entrance area and go to the room beneath it. There is water to the right of where Mario lands. There is also a pipe that allows Mario to go back and two rooms to the left. The first room has three Dark Koopas, defeating all of which will reveal a ! Switch that can unlock the shortcut pipe in the room to Boo's Mansion from Chapter 3. In the second room to the left, there is also a movable block in the lower place that can be used to hit three invisible blocks to fill the gap, and a Super Block across the gap in the higher place. The path to the right is required to start Chapter 7. It is available after getting Sushie from Chapter 5. After crossing the water with Sushie, a Blooper fight occur, after which drops a ! Block that unlocks the shortcut pipe to Yoshi's Village.
In the first room to the right of the water area there are two Dark Koopas, a high ? Block with a Shooting Star in it, and a pipe in the north protected by a gap filled with spikes. Mario has to ride on Lakilester to pass the spiked area for the Ultra Boots before he can proceed to Chapter 7. The pipe goes beneath. The first room beneath has zigzag paths, with Spinies and hidden blocks containing a Maple Syrup, a Stop Watch and a Volt Shroom. The second room beneath has wider grounds, with two Dark Koopas and a line of high blocks at the center of which is a hidden block containing a Life Shroom. The final room has trampolines, and the Ultra Boots at the end. After getting the Ultra Boots, Mario can hit the high blocks in the previous room and in the room before descending to this area.
In the second room to the right of the water, there is a gap that can be crossed by hitting the invisible coin blocks with the Ultra Boots on the lower ground. Across the gap is the blue door. Although it is possible to reach the blue door immediately after getting Lakilester and therefore the Ultra Boots, it won't open until Mario visits Merlon's house and meet the Ninji before Chapter 7. The room behind the door has a single pipe leading to a frozen area, in the left of which is a Super Block and to the right of which is the pipe to Shiver City. Finally, there is a pipe in the southeast of the gap area that go down to a room with cracked wall on the right. Blowing up the wall with Bombette reveals the last room in the tunnels, with Rip Cheato selling items and a pipe to the blue house in Toad Town.
In Toad Town, there is a blue house to the north of the entrance pipe of Toad Town Tunnels (called "Odd House" in the description of Odd Key). There is a Toad near the blue house commenting on Princess Peach. The house is locked from the inside at the beginning of the game. After Mario and friends clear the tunnels, they can take the pipe in Rip Cheato's room to go to the inside of the house. The Odd Key can be found inside, which can then be used to unlock the house from inside. After this, the blue house will serve as the second entrance/exit of the Toad Town Tunnels.
Warp Pipe Shortcuts
In addition to the items listed below, several kinds of items can be purchased from Rip Cheato.
Names in other languages