Of course the trick there is... does the keyboard show letters as eliminated? That's the deduction you have to do in mastermind. And if the keyboard highlighte

Of course the trick there is... does the keyboard show letters as eliminated? That's the deduction you have to do in mastermind. And if the keyboard highlighted "right place" letters for the most recent guess it wouldn't be mastermind. So really it would just show letters you have or have not yet guessed, but without any indication on if they are right, or in the right place.