Here are the ten top selling titles on Steam for the week as reported by Valve:
1.Batman: Arkham Origins
2.DayZ
3.PAYDAY 2
4.South Park: The Stick of Truth
5.Rust
6.Dark Souls II
7.Crusader Kings: Rajas of India
8.Space Engineers
9.Banished
10.Counter-Strike: Global Offensive
