CO-OP DWARVEN MINING
Coffee Stain Studios, the creators of Goat Simulator and the Sanctum series have just released a co-operative game designed using the Left 4 Dead formulae of working together to achieve map goals. This take on the genre has you running around with a a trio of other Dwarven miners to scale walls, bypass bottomless pits, avoid evil heeby geebies and mine your way to riches and glory!
At it's pricing, I must admit I am very suprised they have not released a 2 or 4-pack purchase option (hint hint hint someone hint hint cough hint), but going by gameplay videos and PcGamer and Rock Paper Shotgun's raving over the Beta's they have played, I feel very confident highly recommending this title to you lot.