Screenshots

Description

Try a new kind of math game in line with the Math Revolution envisioned by innovators like Youcubed and AOPS. Designed especially for children 6-11, "21 Marbles" doesn't quiz or time the player, instead it let's them enjoy thinking and reasoning.

A puzzle game's level progression is a natural "low floor, high ceiling" exercise. In the case of 21 Marbles, while the puzzles can become challenging enough to be enjoyed even by adults, the game has a friendly progression of difficulty that keeps everyone on board.

For the youngest players, it has the additional benefit of practicing the most basic arithmetic facts in an instinctive way. For the adults, it's like a relaxing peg solitaire game.

There are no instructions because the rules are natural and intuitive. 21 marbles - of colors and designs for all tastes - are won one by one. In every level, the recovered marbles - each representing the number 10 - break randomly into pairs of smaller marbles: either into a 9 and a 1, or an 8 and a 2, or a 7 and a 3, or a 6 and a 4, or two 5s. The marbles get positioned randomly on a board, and can be merged back together into 10s, by knocking together pairs that sum to 10. It is always possible to recover all 10s, but some thinking ahead is required. The "undo" button is always there to let you trace back your steps and find your mistakes. Learning to think ahead is not optional, and is the most important educational aspect of this game.

What’s New

Version 2.0.1

Sharing your progress with friends is now a click away. Actually, a click and a parental gate away, to be exact.

Ratings and Reviews

4.6 out of 5
47 Ratings
47 Ratings
murrayphd ,

Shucks. Does it really stop at 21?

It was just getting good! Of course game seems designed for kids, and as an adult, I have an advantage. The challenge level improves as the numbers get higher.

Developer Response ,

Thank you for your feedback! I am thinking of an infinite-play version to be added to a future update, so don't delete the game just yet (or check back later).

George_Ec ,

Fun

Nice game. No pressure.

Tesseract Dancing ,

Wonderful Game

Of course it is 5 stars‼️It should be six. It is an excellent little game.

Information

Seller
Elitza Maneva
Size
51.6 MB
Category
Games
Compatibility
Requires iOS 8.0 or later. Compatible with iPhone, iPad, and iPod touch.
Languages
English, Basque, Bulgarian, Catalan, Czech, Dutch, Finnish, French, German, Hebrew, Indonesian, Italian, Japanese, Korean, Malay, Norwegian Nynorsk, Polish, Portuguese, Russian, Serbian, Simplified Chinese, Slovenian, Spanish, Swedish, Traditional Chinese, Ukrainian
Age Rating
Rated 4+
Copyright
© 2018 Elitza Maneva
Price
$1.99

Supports

  • Family Sharing

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

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