I remember "Manic Miner" for Spectrum had a card with a colour matrix[0] and you had to enter the correct one to play, in that time colour copies were not avail

I remember "Manic Miner" for Spectrum had a card with a colour matrix[0] and you had to enter the correct one to play, in that time colour copies were not available or more expensive than the game. [0]http://archive.worldofdragon.org/index.php?title=Manic_Miner http://archive.worldofdragon.org/index.php?title=Manic_Miner