This is the only solitaire app I have found that allows you to play with the Kings only turned off. Any card can be moved into an empty space. For me this is much more challenging to see if I can find a solution each game. It is been a long time since an update but I am still able to play. I dread the day when I can no longer play.
Marsie-V about Solitaire Classic LSolitaire, v1.24