1977 electronic handheld quiz game, in which you can play 9 versions of the classic brain game. At first sight you could be forgiven for mistaking this green flourescent display pocket game for a calculator. Invicta's "Electronic MASTER MIND" is, apparently, "The electronic version of the world's greatest game". The aim is to "Break the hidden code set by the computer, or set your own". It was made by Invicta in Leicester, England.