It adds 6 values together from 0 to 10 and displays the total. It detects if that total is less than 21. When you end your go, the AI "hits" until it's total is greater than yours or it goes bust. There is win detection which is displayed as a rectangle to the right of your total, if that lights up you win. Most of this is accomplished through the use of Signal Strengths and some new circuits I designed myself to do the adding.
Go to the coordinates specified. The pressure plates to your left "hit", the pressure plates to you right "stay". The goal is to get as close to 21 as possible without going over. Hitting adds a new number from 1 to 10 to your total. When you stay, the AI plays the game and attempts to beat your score. You are the Bottom, The AI is the top. The rectangle to the right of your total lights up if you win.