Card Adder 21
Card Adding Mental Training
About
Enhance your mental math skills by tracking a running total as cards are dealt. Progress through increasingly challenging levels with a timed element. The game offers progress tracking and is designed to make counting enjoyable.
What's New in Card Adder 21
1.3.7
July 10, 2026
UI facelift! Pro (ad-free) lifetime upgrade now available! Bug fixes.
In-App Purchases
$4.99
Card Adder 21 Pro Lifetime
Remove ads permanently and unlock Pro features.
Developer apps
FAQ
How do you play Card Adder 21?
Cards are dealt one by one, and you must keep track of the running total to advance through levels. The game features progressive difficulty and a timed challenge.
What are the main features of Card Adder 21?
Card Adder 21 offers progressive difficulty levels with timed challenges, progress tracking, and a fun card-dealing gameplay mechanic to improve mental adding skills.
Is Card Adder 21 suitable for all ages?
Yes, Card Adder 21 has an age rating of 4+, making it suitable for a wide range of players looking to practice their counting skills.
What devices does Card Adder 21 support?
Card Adder 21 is available on iPhone, iPad, and iPod devices, allowing users to train their mental math skills on their preferred Apple hardware.
How often is Card Adder 21 updated?
The latest version, 1.3.6, was released on May 11, 2026. Future updates are planned to include Game Center high scores and personalized progress tracking.
Does Card Adder 21 have ads?
No, Card Adder 21 does not contain advertisements. Ads are only shown on losing segments, making the core gameplay experience ad-free.
What is the user rating for Card Adder 21?
Card Adder 21 has received a perfect rating of 5.0 stars from one user review, indicating high user satisfaction with the game's concept and execution.
Can I track my progress in Card Adder 21?
Yes, the game includes progress tracking to help you monitor your improvement over time. Personalized progress tracking is also planned for future updates.
