Comparison

Strong Mind Puzzles vs Sudoku 21A

Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.

Head to head
About

Strong Mind Puzzles

This game challenges your brain with progressively difficult puzzles designed to enhance cognitive skills. It helps users reduce impulsivity, improve planning, and develop introspection through unique gameplay mechanics.

Highlights
  • Progressively difficult puzzle variations
  • Internal dialogue for skill building
  • Reduces impulsivity
  • Enhances planning behavior
  • Encourages introspection
  • Error-detection reflex training
Features
Read full description

Strong Mind Puzzles update provides progressively difficult variations. This encourages deliberate rehearsal and enhances learning. The rules, graphics, number of icons, and abstract images become more complex. Individuals must use the voice in their head to match the goal and complete the game. The voice in our head (internal dialogue) builds executive skills because it helps: * reduce impulsivity * contributes to planning behavior * encourages introspection and reflection * provides a system to generate alternatives This updates include all previous Strong Mind Puzzle Variations. The user is able to control their starting point and progression. The user has the flexibility of moving between games to individualize their learning experience. — Strong Mind Puzzles is a game designed to challenge your brain. In her 35 years of cognitive restructuring practice, Dr. Markus created a series of paper-and-pencil puzzles to explore new ways to challenge the brain and rehearse cognitive abilities. To reach beyond her clinical practice, these puzzles were converted to a mobile format which provide numerous, varied opportunities for learning. Effective problem-solving and decision-making is based, at least in part, on the number of variables a problem solver or decision maker is capable of evaluating. With deliberate rehearsal, individuals can learn to increase the number of variables that they use to make a decision. -- Why Finding Mistakes Develops Critical Thinking Behaviors Strong Mind Puzzles can help reduce mistakes. Think about what happens when you make a mistake. You become emotionally attached to the mistake. As a result, this emotional investment makes it difficult to examine results objectively. Such reasoning helps explain why we are better at catching other people's mistakes than our own errors. These puzzles give you practice in identifying and learning to anticipate errors. When you are comparing and contrasting images you search for mistakes. With practice, this develops an error-detection reflex.

About

Sudoku 21A

Challenge your brain with a free Sudoku app offering multiple difficulty levels and two engaging game modes. Compete against yourself or friends online with an endless supply of puzzles and helpful aids.

Highlights
  • Six difficulty levels
  • Individual game mode
  • Online multiplayer mode
  • Infinite Sudoku combinations
  • In-game clues
  • Customizable features
  • Smart aids
Read full description

Free Sudokus app where your brain capacities will be tested. We offer you: - Six levels of difficulty: Super easy, easy, medium, hard, insane and inhuman to fit your level. - Two game modes: • Individual: You will compete against yourself to get the best time. • Multiplayer: You will compete online against a friend with the same sudoku to see who finishes first. - Infinity of combinations so you do not get tired of playing. - Clues in case you find it difficult to go on. - Customization of features to enhance your experience. - Smart aids such as notes, counting, auto-delete notes, warning of obvious errors and much more ... Don’t think it twice. This is your app! Download it and tell your friends so that the experience is maximum.

Screenshots

Strong Mind Puzzles4 screens
Sudoku 21A3 screens

Verdict

The call

The clearest difference is review sentiment: Strong Mind Puzzles at 45% against Sudoku 21A's 0%. Strong Mind Puzzles also leads on rating (3.8 vs 1.0) and ads (none vs shown). Sudoku 21A's advantage is price (Free vs $29.99) and in-app purchases (none vs 1). On device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Sudoku 21A is free to download; Strong Mind Puzzles costs $29.99 up front. Strong Mind Puzzles sells 1 one-off in-app purchase. Sudoku 21A asks for nothing beyond the download.

ReceptionRating · Positive reviews · Number of ratings

Strong Mind Puzzles holds the better App Store score, 3.8 against 1.0. That said, the two scores are not equally well evidenced: Strong Mind Puzzles has 11 ratings behind it against 2, so its average is the more settled of the two. Written reviews point the same way: 45% of Strong Mind Puzzles's written reviews are positive against 0% of Sudoku 21A's.

UpkeepUpdate frequency

Strong Mind Puzzles ships an update every 5 weeks, Sudoku 21A every 8 months. The most recent releases landed on November 1, 2026 and October 9, 2026 respectively.

Scorecard9 real differences · 1 level
Strong Mind Puzzles versus Sudoku 21A: the parameters behind the verdict, then further details
ParameterStrong Mind PuzzlesSudoku 21A
Price$29.99Free — better
Rating3.8 (11 ratings) — better1.0 (2 ratings)
Positive reviews45.0% of reviews — better0.0% of reviews
Number of ratings11 — better2
Update frequencyEvery 5 weeks — betterEvery 8 months
AdsNo — betterYes
In-app purchasesYesNo — better
MonetizationPaidAd-supported — better
DevicesiPhone, iPadiPhone, iPad, iPod — better
Requires iOS18.214.4 — better
Further details — not scored
Size9 MB48 MB
Age rating4+4+
DeveloperDonalee MarkusDavid Barbero Carbonell

Customer experience

Strong Mind Puzzles

All ratings10 ratings
Positive70.0%
Neutral20.0%
Negative10.0%
Written reviews20 reviews
Positive45.0%
Neutral15.0%
Negative40.0%

Sudoku 21A

All ratings2 ratings
Positive0.0%
Neutral0.0%
Negative100.0%
Written reviews2 reviews
Positive0.0%
Neutral0.0%
Negative100.0%

In-app purchases

1 purchases

Strong Mind Puzzles

One-time1
  • Levels 4-9$1.99
None

Sudoku 21A

No in-app purchases

Questions

Is Strong Mind Puzzles free?
Strong Mind Puzzles costs $29.99, and also offers in-app purchases.
Is Sudoku 21A free?
Sudoku 21A is free to download, with no in-app purchases.
Which has better reviews, Strong Mind Puzzles or Sudoku 21A?
Strong Mind Puzzles is rated higher. Strong Mind Puzzles averages 3.8 out of 5 from 11 ratings, while Sudoku 21A averages 1.0 from 2 ratings.
Do Strong Mind Puzzles or Sudoku 21A have ads?
Sudoku 21A shows ads; Strong Mind Puzzles does not.
Which is updated more often, Strong Mind Puzzles or Sudoku 21A?
Strong Mind Puzzles ships an update every 5 weeks, and Sudoku 21A every 8 months. Most recently, Strong Mind Puzzles was updated on November 1, 2026 and Sudoku 21A on October 9, 2026.

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