The Talos Principle is out on Thursday and getting rave reviews now the embargo has expired, and you can still secure a cheap PC deal on The Humble Store. They'll save you nearly £10 versus the Steam RRP and £3 versus Greenman Gaming's latest voucher code. You'll get a Steam code to boot.
The Talos Principle is what happens when the creators of Serious Sam and The Swapper get together: a first-person puzzler with imaginative laser mechanics, medieval setting, explorable non-linear world and thought-provoking challenges, powered by the impressive visuals of Serious Engine 3. If you're not sold, why not check out the public test/demo on Steam!