A second player can jump in and clear the screens using a color-swapped version of player 1.
Destory all blocks on the screen with your flying spaceship to advance to the next level. Enemies come in and will attack you or place new blocks. With each completed level a picture of a man or a woman is gradually uncovered with the full image being visible after the boss fight. Depending on the version this is either somewhat tame, an anime picture or something a bit more revealing.
This page contains co-op info for Glass on the Arcade [Classics]. All information about Glass was correct at the time of posting. Information is subject to change. If you see any errors please email us.