Late 70s, not sure of system. Green text old school terminal. 8x8 grid of dots, Z for zombie, Y for you, Star symbol for swamps. Zombies move towards you per turn, you have to move to guide them into swamps to stay alive. I think I was around 4?

Around the same time but I don't actually remember this happening. Colossal Cavern text adventure, at the end none of the adults could kill the dragon. It's said that little kid me typed (said?) "with hands" and killed the dragon with my bare hands. I don't know if that's true or something my dad made up.