Dwarf Complete

All you have to do in Dwarf is collect a set of 40 items, simple eh?

But, to get said items you will have to figure your way around an array of horribly simple puzzles. So simple you will easily spend thirty minutes over-thinking everything, before a friend pops his head over and then points at the completely obvious thingamajig you didn't think had anything to do with this bit, but it clearly does. Which then lets you get to the next sublimely 'easy' conundrum. This scenario is repeated with a wide array of different puzzles, all varied enough to ensure it never gets old.

Controls are easy; up, down, left, right and 'click'. Dwarf is completely intuitive (once you have your head around the first puzzle at least, and you know where to be thinking). There are no instructions, or none in English at least. But you don't need them. Just start.

Dwarf even comes complete with an inbuilt autosave feature. Lovely, all this quality and forethought and it's all free. Its a great way to waste an afternoon at work with your colleagues (you will need them); and if your boss gets bossy - team building, innit!