Portal 2D – like portal 3D, but runs right from your browser. Your only weapon is a gun that shoots portals, and your job is to get from entrance to exit. The first few levels are extremely easy as they just show you the ropes, but gets progressively harder as it require you to use gravity to your advantage. For example, if you fall from a great height into a portal, then come out of a portal that shoots you out horizontally from a wall, the gravity is transferred from your jump. Cool, eh?

If you like it, you might as well buy the 3D version from Valve. It’s short, but way worth it.

Play Portal 2D