"THAT" is a single player source mod that runs on the 2007 SDK engine. It is more of an art installation than it is an actual game, it is my also one of my personal endeavors to push the "games as art" movement which I strongly believe in. The game features abstract surreal scenery and doesn't really contain an objective, it is more of a game to relax to and explore. The game is set in a grid of 9 maps, starting in the center (5th map). You can travel between the maps at your own leisure. I hope you enjoy it and that it encourages game designers to think outside the box when it comes to creating games.
it's very interesting, but i don't enjoy the fact that it doesn't have any kind of guidance or objective.
scenarios were very good, but it might need a bit of development in level design, most of the "cubes" were very easy to spot and even easier to catch...
give it a try, you probably will not love it, but i assure you you will not regret it.