Your first computer game in childhood?

My first computer game was Tetris (and short after Super Mario Land) on Gameboy, if that counts as a computer.
Otherwise it was Lotus Turbo Challenge 2 on an Amiga 500. Lotus had very realistic graphics for that time.
Upgrading the RAM from 512 KB to 1024 KB brought a massive reduction of loading times from many minutes to just a few minutes of waiting.