A single-player coop experience that requires thoughtful planning to solve its brilliant puzzles.

The best "challenge" platformer, providing sliding, wall-jumping speed runs that are oh-so-satisfying.

Great use of gravity and physically-impossible levels make for great puzzles.

The best puzzle platformer. Ever. Manipulate time in ways that screw with your mind.

Essentially Quake III Arena, the pinnacle of purist competitive shooters.

One of my top 3 games of all time. A frantic FPS that feels like a shmup in wonderfully labyrinthine levels.

Who doesn't want to use a gravity gun to throw toilets at people?

Perfectly polished and a wonderfully expressive set of simple mechanics.

The most marvelous use of game physics to date.

The multiplayer in Blacklist (inherited from Chaos Theory and other games in the series) is the best example of asymmetric multiplayer out there.