A glass in-game.

Glass is the first obstacle of the game. It can broken by balls. Glass may hook on to a metal or may be animated. It is usually seen in every checkpoint in random appearances.

In Checkpoint 7, it's "'possible'" that a glass will fight back against the player by throwing glass to him/her.

In Zen Mode,they will mostly appear as a pane in normal exhibitions, and cubes in zero-gravity exhibition s