Steam is holding a sale to celebrate Halloween and there's plenty of titles that are being offered at 50% to 75% off. Let's see some of the highlights.
The Darkness 2 - $12.49
Orcs Must Die! 2 - $7.49
Dead Rising 2 - $7.49
Magicka - $2.49
Left 4 Dead 2 - $4.99
Killing Floor - $4.99
Dungeon Defenders - $3.74
FEAR 3 - $4.99
The sale will continue until early November, so hop on it while you can.
Source: Store.steampowered.com