
I made one of these (not in java script) on a zx81 in 1984. It was a bit poor in 1KB of memory. The next xmas I got a ram pack (held on with elastic bands) - in under 2 weeks of programming later the game was 16 times better.
( , Wed 15 Oct 2014, 22:18, Reply)

( , Wed 15 Oct 2014, 22:21, Reply)