This is Dozen which is not Dozen - we take last 12 numbers (repeaters or not) and risk on them....
So on 12 different numbers we place 1 unit and if we get no hit, we add +1 on each number.
If some number hit (I am not sure: to reset on 1 unit if hit in first 3 spins, and maybe go 2 or 3 back in progression if Win happen later?) and continue with same numbers.
Can you make it that we go 2 back if hit 4-7 spins, and 3 back in progression if 8-11 or something like that , not to go sky high !?
If new high, reset on 1 unit.
Let us choose how far Max in progression we want to go (what do you think, max 20?, or 5?).
Or you can just make it as was my first version:
Max progression: 5, after hit reset on 1!
Happy coding, Master of Rx!