One of the funnest video game things i've ever done is build a little computer in minecraft, back when redstone was first introduced. just 4 bits, input as swit

One of the funnest video game things i've ever done is build a little computer in minecraft, back when redstone was first introduced. just 4 bits, input as switches and output as torches. Add, subtract, multiplication, jump if zero. the 256 bits of memory took acres of space. absolutely useless excercise, aside from being a fun way to spend some time.