Place numbers 1 to N in an NxN grid so that no digit repeats in any row or column. Numbers inside each cage must combine using the given operation to produce the target number. Every puzzle has exactly one solution, solvable through pure logic — no guessing required.

▸ CAMPAIGN: 10 WORLDS, 179 LEVELS
Start with addition on small grids, then unlock new operators and mechanics as you progress. Each world introduces a new concept — you never learn two things at once.

– Addition Valley – Learn the basics on 3×3 and 4×4 grids
– Subtraction Pass – Non-commutative operations enter the game
– Multiplication Forest – Factor your way through larger cages
– Division Realm – Complete the classic four operations
– Mystery Cage – The operator is hidden; deduce it yourself
– Exponent Tower – Powers and exponents join the puzzle
– Inequality Maze – Greater-than and less-than clues between cells
– Diagonal Path – Main diagonals must also contain unique digits
– Killer Dungeon – No repeated digits within any cage
– Dark Cage – Target, operator, or both are hidden

▸ WHAT MAKES ZOKKU DIFFERENT
– Layered mechanic system: 6 operators + 3 modifiers that unlock gradually
– Three levels of mystery cages: hidden operator, hidden target, or both
– Combinable modifiers: inequality + diagonal + killer in the same puzzle
– Zero ads during gameplay — solve puzzles without interruption
– Dual theme: dark and light, your choice
– Full undo/redo with auto-save — never lose progress

▸ FREE MODE
Configure your own puzzles. Pick grid size (3×3 to 9×9), choose operators, set mystery cage ratio, toggle modifiers. Unlimited procedurally generated puzzles.

▸ DAILY CHALLENGE
A new puzzle every day. Build your streak. Monday is easy, Sunday is hard.

▸ FOR ALL SKILL LEVELS
Casual players enjoy the guided campaign. Hardcore solvers push into 9×9 grids with killer + diagonal + full mystery. The star system rewards clean, fast, hint-free solves.

★ Complete a puzzle
★★ Complete without hints
★★★ No hints, no errors, under par time

▸ DETAILS
– 10 languages: English, Turkish, German, French, Spanish, Portuguese, Italian, Arabic, Japanese, Korean
– Full RTL support for Arabic
– Pencil marks / candidate notes
– Haptic feedback and sound effects
– Works fully offline

If you enjoy Sudoku, KenKen, Killer Sudoku, Calcudoku, or Mathdoku — ZOKKU is your next puzzle obsession.

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