Welcome to Zone 21 - Math Solitaire a Brand New Mathematics game where you can win Real World Rewards and Cash Prizes (where available)!

Remove the cards from the board and try to stay between 0 and 21. Keep the target number close to 21 for more points. Exactly 21 will give you best points.

Some Key Features:
• Classic Solitaire Card game with some amazing twists!
• Clear the cards from table and stay between 0 and 21.
• Ready for the challenge? Try to hit the target number 21 and get the great bonuses.
• Play for free as long as you want without constantly sitting through ads.

Multiplayer Features:
• Play against friends and solitaire around the world!
• Calculate cards as quick as you can! You have 3 minutes to beat your opponent.
• Win and show off your scores on the leaderboard!

Earn Prizes:
• Challenge people from around the world
• Put your skills to the test and compete to win cash prizes!
• Cash rewards for top scorers (where allowed)!

Download Zone 21 - Math Solitaire and test your calculating skills today!

If you have any questions or proposals to the game, we hope you contact us at
If you have any questions about the Skillz system or cash tournaments please contact:

What’s New

Version 1.0.6

• bug fix
• faster cards

Ratings and Reviews

4.8 out of 5
16 Ratings

16 Ratings

Art Tartery ,

WHEN THE CASH GAMES COME¿?The best game of SKILLZ - cannot wait to play cash...

All games by this company have great action, music, outlook, and they are good to improve your intellect. PLEASE INFORM ME WHEN CASH TOURNAMENTS ARE AVAILABLE!!!!!!!!!! The first time I do play a game without an ability to participate IN CASH TOURNAMENTS! You got me. Extra class! You are the smartest creators on the market.

Ang-i ,

Big boy

Super great games, creators and staff. They always respond in a matter of minutes and they take care of you well.

Big mom 2.0 ,


It’s a good game will be better

App Privacy

The developer, CodeCube Brothers Partnership, has not provided details about its privacy practices and handling of data to Apple. For more information, see the developer’s privacy policy.

No Details Provided

The developer will be required to provide privacy details when they submit their next app update.


  • Family Sharing

    With Family Sharing set up, up to six family members can use this app.

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