Trine 2 is a sensational puzzle plaformer; besting even its excellent predecessor with brilliantly-paced and cerebral physics-based brainteasers. On top of luscious fantasy art direction, it's also a gorgeous graphical powerhouse - and a cooperative experience that takes some serious beating. And it's three quid. Bargain.
You can alternatively grab the digital collector's edition for £4.50, which includes a digital artbook and soundtrack. Credit to dmorison at HotUKDeals, who found this before we did.