Just noticed this over on Bluesnews, and it is one of the first fruits of the recent announcement of UDK, Unreal’s free-to-use engine package: the standalone version of rather clever spatial/time puzzle mod, Prometheus. Get it here, it’s just 321mb, no Unreal games necessary. And no, we won’t be announcing every UDK thing that comes along, it’s just that this something actually worth spending some time with. Give it a whirl, there’s some brains in them there bits.
More of this sort of thing