Circle 99 vs Math Decoder
Price, ratings, monetisation and update history for both apps, side by side β with what reviewers say about each.
Circle 99
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Circle 99 is a challenging puzzle game where the object is to arrange the numbers so that the sum of each circle is 99. Circle 9 provides practice with the addition of integers. Numbers used in the puzzle are decimals and range from 9 to 61. Puzzles are randomly generated and so the game can be played over and over again providing hours of fun. If you like soduku or magic square puzzles then you will love Circle 99. Special features make using Circle 99 fun: 1. Slide numbers into place to solve puzzle. 2. Random puzzles automatically generated. 3. Sound effects.
Math Decoder
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Math Decoder challenges students to solve math problems presented as codes. Find the answer to addition, subtraction, multiplication and division problems by studying the symbols and decoding the numbers. Completing the activities involves using mental math skills. Math Decoder is designed to be a quick math exercise that teachers can use to provide practice in problem solving. Earn a trophy by answering 20 problems. Special sound effects make the game fun to use and the interactive design facilitate problem solving strategies.
Verdict
Circle 99 and Math Decoder are too close to call on the numbers: across 6 compared parameters β price, update cadence, ads and in-app purchases among them β neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price Β· Rating Β· Positive reviews Β· Number of ratings Β· Update frequency Β· Ads Β· In-app purchases Β· Monetization Β· Best chart rank Β· Devices Β· Requires iOS
Circle 99 costs $0.99 and Math Decoder $0.99 up front. Neither carries in-app purchases, so what you see is what you pay.
Circle 99 ships an update every 38 months, Math Decoder every 36 months. The most recent releases landed on June 11, 2026 and September 20, 2026 respectively.
| Parameter | Circle 99 | Math Decoder |
|---|---|---|
| Price | $0.99 | $0.99 |
| Update frequency | Every 38 months | Every 36 months β better |
| Ads | No | No |
| In-app purchases | No | No |
| Devices | iPad | iPad |
| Requires iOS | 13.2 | 12.0 β better |
| Further details β not scored | ||
| Size | 5 MB | 28 MB |
| Age rating | 4+ | 4+ |
| Developer | Ventura Educational Systems | Ventura Educational Systems |
In-app purchases
Circle 99
No in-app purchases
Math Decoder
No in-app purchases


