Pyrofer writes –

Here’s a single chip game watch – using only a nokia 3310lcd and a pic 12f683. I’ve written a boulderdash clone you can wear on your wrist powered by a single cr2032 battery, lasting several days & the whole thing is very low power. Large scrolling maps mean the small screensize isnt too much of a limit.

Pyrofer’s Projects » 3310 Nokia LCD & PIC 12f683 – Link.