A few things I thought about recently about the game board on CC... a) what kind of computer was used to generate the board, ie, was it an Amiga, or some kind of dedicated video CG generator, or something else perhaps; and b) was the rebus itself loaded as a file in the computer, or was it keyed on from an art card?
Also, a quick search doesn't bring up any mention that CC premiered 20 years ago yesterday, so Happy Anniversary to CC, hoping to see Concentration on our screens again sometime, somewhere in the future.