You can currently take advantage of a tasty pre-order promotion over on Green Man Gaming. If you pre-purchase Keebles for £4.48 using voucher code JBTBG5-7GVTE8-W2YXRV, you'll get Clickr, Rooms, Rabbit Hole 3D and PID for free, which is a bit of a bargain.
So what is Keebles, then? "A physics-based vehicle building puzzle game," apparently. You'll build weird and amazing vehicles, using beams, wheels and gadgets found on Keeble Island to navigate challenging terrain and save the Keebles, including master rockets, balloons, parachutes and more. Thanks for the tip, gooner!