AO is a puzzle game developed by Second Dimension for the NES.

You control a brick in this 2D world, which is tricky as you really need to think in 3D. The brick takes up 2 spaces when it's laying on its side and 1 space when it's standing up. This is important because you'll need to maneuver through some tricky mazes without falling off of the edge. Don't worry if you do, though, you have unlimited lives!