Portwall LD is X-0ut's barebones effort at remaking Valve's sleeper hit in under 48 hours for the friendly Ludum Dare 14 competition. Similar to Portal, you can create two separate pathways using the left and right mouse buttons, but the gravity in this contest submission is rather harsh and the player does not have heel springs to save them from a long drop to the ground.

Veterans who have memorized the quickest routes for every chamber in the original can expect to be challenged here, although there's not a lot of levels to play at the moment due to time restrictions presented by the contest rules. (updated version)