Quantum Conundrum - Quantum Conundrum is a First-person Perspective game with strong Sci-fi, Puzzle-Platform, and Single-player elements published by Square Enix and developed by Airtight Games.
Narbacular Drop - Using two interconnected portals you can place on walls, ceilings and the floor, you must navigate your way through a sentient dungeon.
Portal - Financial Aid Award Letter, - Messages and Calendar, - Grades.
Proteus - Proteus - Proteus is a great electrical suite for circuit simulation purposes. You can simulate a single processor or multiple ones at the same time. The application is a great alternative for Virtual System Modelling.
Portile - Portile is a 2d, tile-based take on Narbacular Drop (more than Portal, because momentum plays a big...
Promethius - Graphic style similar to Portal. Time based puzzles with a twist.