If you like thinking or puzzles games, you need to give The Witness a try. It's unlike any other game I've played. There are puzzles everywhere, puzzles you won't even realize are puzzles until it just clicks in your head that you've been ignoring something. The most obvious puzzles in the game are presented as tiles where you draw a path on the maze to get from the beginning to the end. This sounds simple enough, but as you progress through the game, you start to learn new rules about how the mazes must be solved which make you amazingly frustrated... until you figure out the new rule. Nothing in the game is explicitly given to you, but the solutions (or at least a way to get to the solution) are all around you in the environment. Which, by the way, is beautiful. This game was developed by Johnathan Blow, creator of the game Braid... another fantastic game. I've only put about 4 hours into the game, so far, but it is absolutely 100% worth the $40 price tag if you're a fan of problem solving. EDIT: Here is a great article on ArsTechnica that goes a little deeper into the game without giving away any spoilers.