GamersGate always has a lot of offers every week but some of the standouts this weekend are the Two Worlds franchise which has 70% off its price, and Rocksteady's Batman Arkham Asylum and Arkham City which are both half price. Meanwhile, Amazon has Telltale Game's Poker Night At The Inventory for just $2.49.
GreenManGaming has a good selection of weekend promotions, including Chivalry Medieval Warfare for 50% off, as well as two great SEGA bundles including a Sonic The Hedgehog bundle as well as SEGA retro bundle with plenty of Genesis and Dreamcast titles. Meanwhile, GOG.com has 50% off Daedalic adventure titles like Daponia and The Dark Eye: Chains of Satinav.
Chris already let you know that the excellent Mark of the Ninja is 66% off this weekend on Steam so that just leaves me to tell you that other medieval multiplayer title War of the Roses is 75% off and free to try out this weekend.
As always, if you find some great weekend promotions on PC and Mac downloadable games, let us know in the comments!