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Castle Crashers is the Steam daily deal for 5/10/13 at 50% off. There’s also a release Special Promotion deal for System Shock 2. The game is on sale for 30% off until 5/17. Classic game.
Castle Crashers = $7.49 / £4.99 / €5.99
Castle Crashers 4-pack = $22.48 / £14.98 / €17.98
System Shock 2 = $6.99 / £4.89 / €6.99