Strong Mind Puzzles vs Sudoku 21A
Price, ratings, monetisation and update history for both games, side by side — with what reviewers say about each.
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.
- Progressively difficult puzzle variations
- Internal dialogue for skill building
- Reduces impulsivity
- Enhances planning behavior
- Encourages introspection
- Error-detection reflex training
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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.
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.
- Six difficulty levels
- Individual game mode
- Online multiplayer mode
- Infinite Sudoku combinations
- In-game clues
- Customizable features
- Smart aids
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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
Verdict
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
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.
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.
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.
| Parameter | Strong Mind Puzzles | Sudoku 21A |
|---|---|---|
| Price | $29.99 | Free — better |
| Rating | 3.8 (11 ratings) — better | 1.0 (2 ratings) |
| Positive reviews | 45.0% of reviews — better | 0.0% of reviews |
| Number of ratings | 11 — better | 2 |
| Update frequency | Every 5 weeks — better | Every 8 months |
| Ads | No — better | Yes |
| In-app purchases | Yes | No — better |
| Monetization | Paid | Ad-supported — better |
| Devices | iPhone, iPad | iPhone, iPad, iPod — better |
| Requires iOS | 18.2 | 14.4 — better |
| Further details — not scored | ||
| Size | 9 MB | 48 MB |
| Age rating | 4+ | 4+ |
| Developer | Donalee Markus | David Barbero Carbonell |
Customer experience
Strong Mind Puzzles
Sudoku 21A
In-app purchases
Strong Mind Puzzles
- Levels 4-9$1.99
Sudoku 21A
No in-app purchases
Questions
Is Strong Mind Puzzles free?
Is Sudoku 21A free?
Which has better reviews, Strong Mind Puzzles or Sudoku 21A?
Do Strong Mind Puzzles or Sudoku 21A have ads?
Which is updated more often, Strong Mind Puzzles or Sudoku 21A?
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