Here are the ten top selling titles on Steam for the week as reported by Valve:
1.BioShock Infinite
2.Defiance
3.Age of Empires II: HD Editions
4.Torchlight II
5.Arma III
6.The Elder Scrolls V: Skyrim
7.Chivalry: Medieval Warfare
8.Kerbal Space Program
9.Dead Island Riptide
10.Grand Theft Auto Complete Pack