Enjoy a Free Weekend of Retrovirus and Sol Survivor
While the entire 2k catalog of games is enjoying a big sales weekend on Steam, they're not the only games to be getting a little love. Retrovirus and Sol Survivor are both free until 1 pm PDT Sunday, and if you like what you see, they're also on sale for 60% off! So you can get two great co-op games for around $11 total.