The Humble Weekly Sale features a lineup of PewDiePie-approved games, with sales helping out the Save the Children charity. Available for anything you want is Surgeon Simulator 2013, Guacamelee Gold Edition and QWOP for Android. Up for $6 or more is SpeedRunners on Early Access and Garry's Mod, at $10 or more unlock Probably Archery, and for $15 or more you'll receive State of Decay.
All games are on Steam, except for "QWOP for Android." That one's on – wait for it – Android.