Hey, set myself a couple of hours before bed to remake the famous "Portal" mechanic. It's not finished and full off bugs, but somewhat playable, if you end up disappearing out of the map, just refresh!
Portal in C2
Move - WASD or Arrows
Portals - Left and Right Click
(You can get to the other side of the room without it bugging out, but it may take a few F5's <img src="smileys/smiley17.gif" border="0" align="middle"> )