Not content with just being included in this week's Humble Bundle offer, Tripwire Interactive's Red Orchestra 2: Heroes of Stalingrad is free for you to try this weekend on Steam. The World War II multiplayer shooter has also been reduced by a whopping 85% to £2.24/$2.99 and £2.99/$4.49 for the basic game and Digital Deluxe Edition, respectively.

You get a whole host of extra weapons, as well as bonus Team Fortress 2 and Killing Floor items. Whilst Red Orchestra 2 has been a weekend offer before, this time new players will get the chance to play four new maps that were winners of the Counter Attack Map contest, which sourced user-created maps from the Steam Workshop community.