Back when I was learning how to program as a kid in the 80's on a BBC Micro
I remember playing a game called Beetls or something like that, the idea of
the game was simple, the screen would show a collection of different coloured
beetles and then ask how many of a particular colour there is.
I remember it well because it was all that much harder by the fact I only
had a monitor from an old TRS-80, the bright green monochrome display you
see in those rubbish movies about hackers :)