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About
Sharpen your mind by quickly identifying and summing card values against a timer. Earn in-game currency to unlock new visual themes and improve your counting speed.
✓Card value recognition
✓Timed challenges
✓Running total calculation
✓Unlockable themes
✓Brain training
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What's New in 21 Reflex
1.0.1
March 7, 2026
- Bug fixes
1
In-App Purchases
$1.99
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FAQ
What is 21 Reflex?
21 Reflex is a game designed to train your brain to recognize and sum card values extremely quickly against a clock. It helps improve cognitive speed and reaction time.
How do I unlock new themes in 21 Reflex?
You earn coins for correct answers within the time limit. These coins can then be used to unlock the 14 different themes available in the game.
Does 21 Reflex have ads?
No, 21 Reflex does not contain advertisements, providing an uninterrupted gaming experience.
What devices is 21 Reflex available on?
21 Reflex is available for iPhone and iPad devices.
Is 21 Reflex suitable for children?
Yes, 21 Reflex has an age rating of 4+, making it suitable for younger players interested in cognitive challenges.
How often is 21 Reflex updated?
The latest version is 1.0.1, and the app was last updated on March 7, 2026. Updates typically focus on performance improvements and new content.
Can I play 21 Reflex offline?
The provided information does not specify offline play capabilities. However, its core mechanics suggest it can be played without an internet connection.
What is the gameplay like in 21 Reflex?
The gameplay involves rapidly identifying card values and adding them to a running total before the timer runs out. The goal is to be as fast as a dealer.