This is the fifth in a series of Sudokaches exploring different sudoku variant rules. The word palindrome was introduced by English poet and writer Henry Peacham in 1638. The concept of a palindrome can be dated to the 3rd-century BCE, although no examples survive. The earliest known examples are the 1st-century CE inscriptions of the Latin Sator Square found at Pompeii.
Normal sudoku rules apply. Also, digit sequences along grey lines must read the same forwards and backwards.
Some hints for those who haven't seen this variant before, highlight text to read:
- The palindrome lines create pairs of cells that must have the same value.
- Any digit that can be seen by either cell of the pair can be ruled out of both.
- It is critical to keep your pencil marks in sync.
- It may be helpful to use colouring to help keep track of which digits are paired.
Solve online here if you want: https://sudokupad.app/e2o4icarns
GZ is near a piece of civic infrastructure that could be traversed with a kayak, although there are other means that are more on the level. Happy solving and hunting!