Underwhere Road

Underwhere Road is the setting of Chapter 7-2 in Super Paper Mario. It connects the Underwhere and the Overthere to one another. It is almost impossible to see in Underwhere Road, but Tippi's ability doubles as a flashlight to see where you're going. Mario and Luigi are guiding Luvbi back to the Overthere in this level.

At one point in Underwhere Road, there are two D-Men holding a door closed. They claim that a monster has escaped the Underwhere, and they are trying to hold it in. Mario and Luigi offer to defeat the monster for them, and, though skeptical, they allow them in, saying that if they aren't killed, they'll allow them to pass.

As it turns out, it is not a monster, but rather, Bowser. When Bowser asks where Peach is, he is told that she isn't there; however, he misunderstands them, believing that now that Peach wasn't there, they were going to attack him. After a fight, Mario explains to Bowser what is going on, and the Koopa King rejoins the party.

There are three sealed doors that they must pass through, and only by passing the tests can they do so. Dorguy the First has questions that at first seem complicated, but then are revealed to be ridiculously simple. Dorguy the Second has a more difficult quiz, based on memorizing the colors and patterns of moving shapes shown. Dorguy the Third has a drastically different test; he summons the Underchomp, and the party must face it in a turn-based battle reminiscent of old RPGs such as Dragon Quest.

Trivia

 * The Underchomp is based on the 3 headed dog Cerberus. He shares the same weakness; music.
 * The three hags that are encountered in this level are based off of the three Fates.