Fourules(フォールズ)

Contains adsIn-app purchases
Content rating
Everyone
5+
Downloads
Content rating
Everyone
In-Game Purchases
Learn more
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About this game

Add, subtract, multiply, divide—find the target number!

Enjoy "Crypto," a card game where you combine five number cards using basic arithmetic (+, -, ×, ÷) to create the target number, now available as an app!

Compete for the fastest time across 9 rounds, using up all 54 cards. Aim for a perfect run!

[Features]
• Simple rules for a serious brain battle
• Set a time limit of 1-5 minutes per question
• Choose from 3 difficulty levels for the cards used
• Save your top 5 records
• Share your results on social media
• Supports Japanese and English

Perfect for brain training and math practice!
Updated on
Jun 12, 2026

Data safety

Safety starts with understanding how developers collect and share your data. Data privacy and security practices may vary based on your use, region, and age. The developer provided this information and may update it over time.
No data shared with third parties
Learn more about how developers declare sharing
No data collected
Learn more about how developers declare collection
Committed to follow the Play Families Policy

What’s new


New: Added a "Practice (1 Puzzle)" mode.
Try a single puzzle anytime, and share it on social media as a quiz for friends.
No ads when retrying practice mode.

Other minor improvements.
Content rating
Everyone
In-Game Purchases
Learn more

App support

Phone number
+81529901021
About the developer
JIEI TEIKEI LIMITED LIABILITY COMPANY
info@jiei-teikei.site
1-22-11-2, TORIBAMI, MORIYAMA-KU NAGOYA, 愛知県 463-0076 Japan
+81 52-990-1021