This game here is about "hacking" circuits and get through virtual defenses in a small campaign.
But, just recently, Gregory Weir added an antiblocker, the last thing needed for it to be turing-complete. But the editor grid is small, and you can only make max. 3 bits of memory. But it's fun to mess around with some puzzles.
I made all the possible gates already, by the way. (name's Enthernalcz.) Link