Solitaire Zero 21

Solitaire Zero 21 is a card game where you clear the playing area while keeping your score between 1 and 20. You select cards from the tops of piles; each card applies an addition or subtraction operation to your current score. If your score reaches 0 or 21, or goes below 0 or above 21, the game ends. Only the top card of each pile is visible, so you need to plan your choices to avoid going bust.

Cards and scoring

Wild cards sometimes appear and let you change your score. For example, MIN sets it to 1, while MAX sets it to 20. Clear all the cards without reaching 0 or 21 to win diamonds. If you fail, you can spend diamonds to try again from where you left off.

Campaign and challenges

The campaign starts at Level 1, with difficulty increasing as you progress. You can also collect diamonds to customise the card pack's theme. In the Daily Challenge, all cards are laid out for you to see briefly before they turn over; you then select them one by one.

Achievements and leaderboards

Steam Achievements are awarded for reaching later stages and completing certain levels within a time limit. Progression- and time-based leaderboards let you compare your ranking with friends and players around the world.