This series is highly recommended, though you might hate them if you hate real-time puzzles. A handsome 3D real time adventure game. The Even More Incredible Machine Puzzle solving game. Good time killer, and you can find the passwords to get to new levels if thoroughly stuck. The Dig Graphic adventure game.
Puzzles range from easy to fairly complex.
A challenge for inexperienced adventurers, it may not last long for experienced ones. Toonstruck Graphic adventure game. Lovely cartoon world, where being slightly warped may help you along. Highly recommended for beginning adventure game players, a bit of light fluff for experienced gamers. Role playing game So far, I've only found the body of the murder victim in part I and talked to a few people.