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PAPER / VARIANT

Palindrome Sudoku

Read a grey line either way and the digits match.

Click a cell, then a digit. Arrow keys move, 1–9 place, Backspace clears.

Rules

A palindrome line reads the same forwards and backwards. A five-cell line like 4-1-7-1-4 is legal; 4-1-7-2-4 is not. The middle cell of an odd-length line is unconstrained by the palindrome itself.

  • Digits mirror around the centre of each marked line.
  • Odd-length lines pin their centre digit to itself — no new information, only a fixed point.
  • Even-length lines force pairs of equal digits.
  • A palindrome can contain repeats by design; sudoku rules still apply across the grid.

Good to know

Ordinary sudoku rules still apply underneath the variant: every row, column and 3×3 box holds 1–9 exactly once. The extra rule sits on top and is usually what breaks the puzzle open.

More sudoku

All sudoku variants ↗

Or read how to play Sudoku ↗.