Fez – Purpose of Treasure Maps

There are two "secrets": the four owl puzzle (denoted by a question mark on the node), and the subsequent anticube room.

Four owls

In four places, an owl appears at night. Speak with each one:

1. in the waterfall level near the pillar (green tree, first warp zone),

2. in the windmill level near the windmill (orange tree, air warp zone),

3. in the forest near the transforming cabin (green tree, outside rainy warp zone),

4. and outside the octopus-looking building containing the revolving model of the solar system and the counting cube (pink tree, temple/science warp zone).

These locations were shown on the walls of the fez-wearing elder's house (in Gomez's hometown, across the bridge).

Hidden room

After speaking with each owl, they fly to the rainy warp zone's giant owl room. When all four arrive, a panel reveals a door behind the owl statue opposite the entrance. It leads to another owl room with an anticube.

Glitch: If you remove the patch, the original version of the game had a glitch where you could access the hidden room without the four owls: stand in front of the entrance, rotate the room twice, and press up to enter. Keep in mind, the room won't be "completed" until the main secret (four owls) is finished and the next room is visited.

There are a couple of different types, each with a different solution. You'll figure them all out eventually, and doing so is part of the joy of the game, so I'll provide hints and the complete fix as spoilers.

The thick pillars with vertical glyphs on them: in the library/observatory area there's a room with one of these pillars and a part of the level that responds to your controller inputs.

The vertical glyphs are a line of tetris symbols on its side. Each symbol corresponds to a controller input: the 4 'T' blocks are cursor directions, the square is a jump, and the 'S' and 'Z' blocks are RT and LT respectively. Usually completing these gives an anti-cube, but sometimes they open a door.

The tall thin pillars with a square at the top: you need to be in new game+ before you can solve these. Once you're in NG+ try a different perspective.

Stand on the pillar and switch to first person mode, you should see a tetris symbols glyph nearby. Completing these gives an anti-cube.

The U shaped/tuning fork pillars: feel your controller - it's vibrating in a pattern.

The left and right sides of the controller vibrate the pattern you should repeat with LT and RT. Completing these gives an anti-cube.