Arduino Game - Bulls and Cows or Mastermind

I created this little game as a hobby for my children during the Covid-19 quarantine. I had already seen some versions for two players on the Internet. But I wanted a version in which the player would challenge Arduino itself, because then I could turn the game into a puzzle for Escape Room.

I've found some other versions that use many Arduino Pins. I intended to use as few pins as possible for the system, already foreseeing the possible triggering of other game stages (in the case of developing a puzzle for Escape Room).

In my version I use two arrays of RGB LEDs, a rotary encoder and a buzzer. With that, I use only 5 Arduino signal pins.