Nauticrawl is a game where you learn how to operate a mysterious machine, and discover the secrets of the world by using it. It's relatively short, maybe 4 hours? I thought it was a real gem. Learning how to use the machine was fun and rewarding. The game has a rich atmosphere, and manages to convey a lot of mood and action with a limited interface. The limited window into the game world serves to make this the most immersive game I have ever played. I thought the story was interesting, and the ending was satisfying, although it is open-ended. Definitely recommend this one to everyone. Just don't be frustrated if you fail a few times because you don't know what to do; it's part of the learning process.