トランプたし算：暗算・記憶力・脳トレ計算

Trump Addition is a brain-training math game that simultaneously improves mental arithmetic, calculation skills, and memory (working memory). Simply flip over one card at a time from a deck of 52 playing cards and add the number revealed to the total of the cards played so far. The rules are simple, yet the game is surprisingly deep. It's a free brain-training and calculation app.

You can't see the previous card. You have to remember the intermediate totals in your head while adding the next number, so it truly engages your mental arithmetic (calculation) and short-term memory (working memory). It's perfect for brain training in short bursts of free time or for daily calculation practice.


■ Easy to Play (Just Add Numbers)
• One playing card at a time is displayed.
• Add the displayed number to the current total.
• Enter the total using the numeric keypad → The game automatically moves to the next card when the digits match.
• The previous card is hidden, so you must remember the total as you go.
• Use A=1, J=11, Q=12, K=13 for calculations.

■ A Calculation Game to Train Mental Arithmetic and Calculation Skills
As the numbers increase one by one, this provides practical calculation training by continuously performing addition with carries. The more you play, the faster and more accurate your mental arithmetic becomes. It's a simple calculation game.

■ Also for Training Working Memory and Memory Skills
Because you add the next number while remembering the current total, it simultaneously trains short-term memory (working memory) and concentration. It's a brain training game combining memory and mental arithmetic, unlike simple calculation drills.

■ For Elementary and Junior High School Students' Math/Calculation Practice
A simple calculation drill where all you have to do is "add numbers." It can be used for elementary and junior high school students' math and calculation practice, as well as for mental addition training (※The totals get larger towards the end, making the mental calculation difficulty slightly higher).

■ Features
- Shortest game time: 1-2 minutes. Perfect for commuting, school, or killing time during spare moments.
- Records best score (maximum consecutive correct answers) and best clear time.
- Haptic feedback for correct/incorrect/clear (can be turned off).
- Offline play only. No account registration or internet connection required.

■ Recommended for:
- Those who want to train their mental calculation and calculation skills daily.
- Those who want to train their working memory/memory.
- Those who want to use it for elementary and junior high school students' math and calculation practice.
- Those who want to reset their concentration during spare moments.
- Those who want to easily play a classic mental calculation game using playing cards on their smartphone.

Now, let's add up 52 playing cards mentally and aim to clear all of them and beat your best time!