Palindrome Sudoku: Rules & How to Solve
Each grey line reads the same forwards and backwards, mirroring digits across its centre.
The rule
Each palindrome line reads identically in both directions: cells equally spaced from the centre hold the same digit. The middle cell of an odd-length line can be anything legal.
How to solve palindrome sudoku
Pair the mirrors
The first and last cells match, the second and second-to-last match, and so on — solve one, get its twin free.
Mind the line's path
A palindrome that bends through two boxes links cells you'd never otherwise connect.
Length parity
Even-length palindromes have no free centre; odd-length lines leave the middle cell unconstrained by the mirror.
Frequently asked questions
- What is a palindrome line in sudoku?
- A marked line whose digits read the same forwards and backwards, so symmetric cells are equal.
- Do palindrome cells repeat digits?
- Mirrored cells share a value, but the usual row, column, and box rules still prevent illegal repeats.
- What about the centre cell?
- On an odd-length line the centre is its own mirror, so it's free apart from normal rules.
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