Developer's DescriptionBy Rollic GamesZero21 is a challenging game with a simple rule...Zero21 is a challenging game with a simple rule:Try to stay between 0 and 21. It's not easy!Zero21 Solitaire is a fun numbers game with solitaire flavor to relax and unwind while keeping your mind sharp.Collect all the number cards on the board while keeping your sum between 0 and 21.Enjoy!