Cold outside? Warm up & get How To Survive Third Person for 90% off: http://store.steampowered.com/app/360150/How_To_Survive_Third_Person_Standalone/
Already have it? Then try out the How To Survive for 90% off!
http://store.steampowered.com/app/250400/How_to_Survive/
Don't have your Festive Santa Hat in H2S2 yet? Get the game for 75% off and go play Santa! And kill some Santa zombies too...
http://steamcommunity.com/sharedfiles/filedetails/?id=1238678396
http://store.steampowered.com/app/360170/How_to_Survive