Steam News announces that LIMBO is free to add to your account for the next two days. This isn't a free weekend, however, as the once redeemed, the game is yours to keep. Here's word: "Add LIMBO to your account and play for FREE starting now until June 22nd at 10AM Pacific Time! Once you add the game it will remain in your account after the free period, so don't miss out on this opportunity to play this dark, eerie adventure."