Goal

Fill the grid so each row and each column contains every number once (1 to 4 on a 4×4 grid, 1 to 6 on 6×6), and every inequality sign is true.

How it works

• The signs between squares say which is bigger. < and > work across; ∧ means the square below is bigger and ∨ means the square above is bigger. The sign always points at the smaller number.
• Darker numbers are given. Tap an empty square, then tap a number. ⌫ clears it.
• Repeated numbers turn red, and so does a sign that is broken.
• Every puzzle has exactly one solution.

Tips

• A square that is smaller than its neighbour can never hold the largest number; a square that is bigger can never hold 1.
• Follow chains: if a < b < c across three squares on a 4×4 grid, then a can only be 1 or 2.
• When a row has just one gap, it's the number that's missing.