🎯 Objective

Fill every cell with a number from 1 to N (where N is the grid size) so that each number appears exactly once in every row and every column — and every inequality sign between adjacent cells is satisfied.

📏 The Two Rules

• Latin Square: Every row and every column must contain each number from 1 to N exactly once — just like Sudoku rows and columns.
• Inequality Signs: Where you see a < or > between two cells, the values in those cells must satisfy that relationship. For example, if you see A < B, then A must be smaller than B.

🕹 Controls

• Tap / click a white cell to select it (it glows gold).
• Then tap a number key on the keypad below the grid to place it.
• Tap the ✕ key to clear a cell.
• Alternatively, type on your keyboard after selecting a cell.
• Darker cells are given clues and cannot be changed.

🔴 Error Highlighting

Cells that break the Latin square rule or violate an inequality turn red instantly. Fix them before you can win.

💡 Hint

Tap Hint to reveal the correct value of one empty cell. 3 hints per puzzle.

⚙ Difficulty Levels

Beginner 5×5 Easy 5×5 Medium 6×6 Hard 6×6 Very Hard 7×7 Scientist 8×8 Cyborg 9×9

Higher difficulties use larger grids and reveal fewer starting clues.

★ Daily Challenge

One unique 6×6 puzzle every day — same for everyone. Solve it to grow your streak!

💡 Tips

• An inequality directly gives you a bound — _ < 2 means that cell must be 1.
• Chain inequalities: A < B < C means A ≤ N−2, B is middle, C ≥ 3.
• Fill in cells forced by row/column elimination first, then use inequalities to break ties.
• On larger grids, pencil in candidates mentally before committing.