Red/Blue 3D Glasses
Collect all 64 Cubes and then go back through the Star Gate in the 32 Cube room
for a different ending. After the credits, select New Game + one again from the
main menu. When you reach the point in the story where you received the Fez and
the Sunglasses the first two times you now get a pair of red/blue 3D glasses
instead. These automatically enable Stereoscopic Mode, which can then be
disabled in the Settings menu should you not want to use it.


First Person View Sunglasses
Complete the game and select New Game + from the main menu. When you reach the
point in the story where you recieved the Fez on the first play through you will
get a pair of sunglasses instead. These allow you to view the world in first
person by pressing in the left analog stick.


First Person View Sunglasses - Play New Game+ and reach the point where
you recieve the Fez


Purple Posts
 If you come across a purple post with a square hole at the top, there is a
Tetris code somewhere nearby. Switch to first-person mode to see it. They are
usually on the ground.