A damp little train line beneath a forest of enormous mushrooms.

White towers, blue bridges, and a very long fall back to the top.

Every doorway gets smaller. Nobody remembers where the hall ends.

A mossy monument to the squarest frog anyone has ever seen.

Thirty tiny apartments, one park, and traffic you can step over.

It has switches, blinking colors, and almost no practical purpose.

Books contain rooms, rooms contain shelves, and shelves contain books.

Four forests meet in the middle around one suspiciously perfect tree.

An underwater-looking space built without a single drop of water.

One collectible per tower. Completionists have been warned.

A quiet green world with one tree and one extremely difficult secret.

A monochrome outpost where the smallest crater hides the biggest room.