A quiet revolution on launch, 'Thief' plays like a cross between 'Rainbow Six' and the old playground favourite 'What's the time Mr Wolf'. As a sneaky thief, you have to steal your way through a series of absolutely  enormous, atmospheric 'steam-punk' levels, avoiding guards, laying traps,  and hiding in the shadows. Like almost everything by the late, lamented  Looking Glass, 'Thief' is intelligent, well-presented, extraordinarily  deep, and commercially only so-so.