Portal 2 player creates Non-Euclidean Level for Portal 2.

A Portal 2 player (and amateur level designer) has found a way to make the mind boggling puzzles of Portal 2 even harder than they originally were by creating levels using Non-Euclidean geometry. Now I can’t adequately explain Non-Euclidean geometry to you (because it blows my mind), but I can show you the full video here.

You can also download this level to play in Portal 2 from the users YouTube page.