Shy Guy's Toy Box

Home to the Shy Guys in Paper Mario, and found in a condemned house in Toad Town. The fourth Star Spirit, Muskular, was held here by the leader of the Shy Guys, General Guy and the Shy Guy Army. Watt lives here and after Mario, Goombario, Kooper, Bombette, Parakarry and Bow defeat Big Lantern Ghost, she joins their team.

The Toy Box is essentially a circular railroad with a number of routes leading off the railroads stations. The entire thing also seems to be inside a literal toy box, and entering it shrinks the people down to the right size.