To bring a puzzle to life in the 2011 Microsoft Intern Game, I wrote an optical punchcard reader. The puzzle solver punched their answer into a punchcard form and presented it to a webcam. The software identified the punchcard in the video feed, decided which cells had been punched, and displayed a simulation of how a "robot" responded to those instructions.
I wrote Point which is a C-like compiler and decompiler for Grand Theft Auto scripting around when San Andreas was released. The project hasn't been updated since 2006 so at this point it is only of historical interest.
Elemental was a total conversion of the highly acclaimed game Dungeon Siege, comprised of completely unique worlds and inhabitants. We called Elemental's theme Biblepunkô. The game was set in an alternate mythical version of ancient Judea that is gritty, mean, profane, full of thieves and Romans and whores. And 8 foot tall mantis. Like most amateur modding projects it was never finished but I spent the end of my high school years and beginning of my college years working on it with a great group of people.