If you are talking about gray wool, then it basically cuts off the signal with pistons because when a number is pressed the signal goes through the whole machine and the pistons unlock only the the module that is selected. And no this time its not that advanced, you will have to type in the starting numbers and check if its correct yourself. :) But i may upgrade it some time in the future tho.

it's not finished, so I'm not publishing it yet. I will upload the map when its done :D

yea, I don't want to use command blocks on all of the logic, but ill use them on the keyboard so the game would be a bit faster and the device would look a bit cleaner.