Thank you for the kind words! I am aware that I made the empty piles extremely forgiving. I’ve considered adding “easy mode” or “strict mode” which (depending how it’s implemented) turns on/off “king only” in empty slots. However, in the mean time, you can just choose not to put kings in empty slots. I get that it “breaks the game” but given that you can constrain yourself it hasn’t been a huge bother.