Half Life 2's Flipside

Flipside, a properly freeware total conversion mod for Half Life 2, that, as you should have already guessed, is refreshingly not another FPS variant, has been created by 12 university and art school students from Denmark, and it absolutely shows. The mod uses the Source engine to create a stunningly surreal 2D/3D setting for a platform game and then puts the player in the stylized shoes of a mental patient trying to escape the asylum, or at least the version of the asylum he actually sees.

Interestingly, Flipside constantly alters its colors and/or artwork style to portray the main character's mood changes from an almost delirious happiness to a less flamboyant despair. Then again, to actually understand what I'm talking about you should either have a look at some gameplay videos, or -better yet- download the mod itself.

Related @ Gnome's Lair: more Half Life 2 total conversions, H-L 2 & the society of spectacle, GoldenEye: Source