QuadClue

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.