ASCIIpOrtal

From developer's site ASCIIpOrtal is a unique puzzle game. You can create custom maps so even when the game is over the fun doesn’t need to end. Use a text editor (or the mostly functional map editor by Mads Lund) and share the maps you create on the ASCIIpOrtal forum. ASCIIpOrtal is by Joe Larson with sounds designed by Steve Fenton. Original concept inspired by Increpare’s Portile game, Super Serif Bros, and Valve’s Portal. Source code is included in the zip. Simply unzip and play.