Sudoku with a 4th rule and new mechanics. The higher the difficulty, the more the 4th rule becomes essential to solve the grid.
Tsuidoku is a logic puzzle for players who have mastered classic Sudoku. The 9×9 grid remains, but a fourth constraint changes everything.
THE 4 RULES
Each row, column, and 3×3 region must contain the numbers 1 through 9 AND the 9 colors. The twist: each color must also contain all 9 numbers. The result: 81 unique number-color pairs. Place a "Red 5," and it cannot appear anywhere else.
DAILY CHALLENGE
A unique global grid every day—the same one for the whole world. Maintain your streak, earn monthly medals, and check the daily rankings.
MASTER THE TECHNIQUES
- Rainbow Technique: Track a single number across all nine colors.
- Color Wheel: Track a single color across all nine numbers.
Tap a cell to cycle through highlight modes and see the logic light up.
PLAY TOGETHER
Add friends, compare stats, and chat directly within the app. A detailed profile tracks your records across every difficulty level.
Think you’ve mastered Sudoku? The real game starts here. Download now and create your first 81 perfect pairs.
Ratings & Reviews
5.0
out of 5
2 Ratings
• Night mode: in the evening the app turns midnight blue, and the moon in the logo follows the real moon. Tap the logo to switch, or set your hours in Appearance.
• Pad help: once all nine of a digit or color are placed, its key fades out.
• Fixes and stability improvements.
Version 1.4.1
The developer, Jordan MAIRE, indicated that the app’s privacy practices may include handling of data as described below. For more information, see the developer’s privacy policy .
Data Used to Track You
The following data may be used to track you across apps and websites owned by other companies:
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Identifiers
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Data Linked to You
The following data may be collected and linked to your identity:
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User Content
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Data Not Linked to You
The following data may be collected but it is not linked to your identity:
Diagnostics
Privacy practices may vary, for example, based on the features you use or your age. Learn More
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
Seller
Jordan MAIRE
Size
105.6 MB
Category
Puzzle
Compatibility
Requires iOS 15.0 or later.
iPhone Requires iOS 15.0 or later.
iPad Requires iPadOS 15.0 or later.
iPod touch Requires iOS 15.0 or later.
Mac Requires macOS 12.0 or later and a Mac with Apple M1 chip or later.