Green Man Gaming are offering 20,000 copies of Sniper: Ghost Warrior from 1300 GMT January 1st while stocks last - just use voucher code GREEN-MANSS-NIPER at checkout to receive a 100% discount on the title!
This voucher won’t expire at a specific time, but after it has been used 20,000 times it will stop working!
Update: Website is taking a hit. GMG confirm via Twitter that keys are still available but to be patient as they're trying to get the site back up and running.
Link to game on GMG, rather than the offer: http://www.greenmangaming.com/games/sniper-ghost-warrior/