QuadClue
Color logic puzzle, 4x4 grid
Free · Designed for iPad. Not verified for macOS.
Sixteen squares. Four colors. Every color appears exactly four times.
The clues sit along the top and left edges. Each one names a single color and tells you how many of it belong in that line. Nothing is hidden and nothing is random — every puzzle is built to have exactly one answer, and every answer can be reached by reasoning alone.
HOW IT WORKS
Tap a square to cycle through the colors. Press and hold to pick one straight from the palette.
An inner clue points at one row or one column. An outer clue is twice as long, because it covers two rows or two columns at once — and that extra reach is what makes the hardest levels solvable. When a clue is satisfied, its border turns to a dashed line so you can
see at a glance what is already accounted for.
FIVE DIFFICULTIES
Easy, Normal and Hard give you eight clues: one for every row and every column. That is enough to finish on its own.
Expert and Master add four outer clues for twelve in total, and they are built so the rows and columns alone leave more than one possibility. You cannot finish without reading the outer clues.
WHEN YOU ARE STUCK
The hint button does not fill the square for you. It tells you which clue proves the answer, lights up both that clue and the square it points at, and names the color. Press it again and it moves on to the next one. There is no limit, and if you have put a color in
the wrong place it will bring you back to it.
Undo steps back one move at a time. Clear empties the board without starting a new puzzle.
BUILT TO BE READ
Every color is a cut gem with its own weight and depth, set on a black onyx tray so the four are easy to tell apart. If you would rather not rely on color, turn on the symbol overlay and each one carries a distinct shape — square, circle, triangle, diamond — outlined
so it stays legible on every gem.
ALSO INSIDE
A timer and a best time for each difficulty, kept separately.
Twenty achievements, from your first solved puzzle to clearing every level.
Optional daily reminders, morning and evening.
Sound and haptics, each with its own switch.
Full support for iPhone and iPad.
Your records live on your device. No account, no sign-in, and the puzzles are generated on the spot, so you can play with no connection at all.
Ratings & Reviews
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Minor changes and improvements.
The developer, ryuya matsuo, 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:
- Usage Data
Data Not Linked to You
The following data may be collected but it is not linked to your identity:
- Usage Data
Accessibility
The developer has not yet indicated which accessibility features this app supports. Learn More
Information
- Seller
- ryuya matsuo
- Size
- 5.5 MB
- Category
- Casual
- Compatibility
Requires iOS 26.5 or later.
- iPhone
Requires iOS 26.5 or later. - iPad
Requires iPadOS 26.5 or later. - Mac
Requires macOS 26.5 or later and a Mac with Apple M1 chip or later. - Apple Vision
Requires visionOS 26.5 or later.
- iPhone
- Languages
- English and Japanese
- Age Rating
4+
- 4+
- Contains
Advertising
- Copyright
- © 2026 ryuya matsuo