I went to a hackathon in the T-Rex building in downtown Saint Louis and made a game with someone. It's a relatively simple game, but we only had 48 hours to make a finished product. I'm happy with the way this software turned out, despite being on such a short time limit.
The objective of the game is to connect two roads. The levels are randomly-generated and you can click the tiles on the screen to change them to different roads. When you're ready, you can click the "submit" button to run a pathfinding algorithm to check if you have a valid path or not.