For the next 15 hours you can pick up a handful of Surprise Attack games for discounted prices in the Humble Flash Bundle: Surprise Attack.
Right now you can pay what you want for Critical Mass, Party of Sin, Postmortem: One Must Die (Extended Cut), and Zombie Tycoon 2: Brainhov’s Revenge. If you pay $1 USD or more, Steam keys are unlocked for all of these games. If you pay $7 USD or more you can tag on OTTTD and Megabyte Punch.
Humble provides games at incredibly low prices and puts a portion of all payments towards charity. As always, customers can split their payment between charity, game developers, and Humble tip.
Check out the Humble Flash Bundle: Surprise Attack here: //www.humblebundle.com/flash