Normal sudoku rules apply. Cells separated by a single knight's move (in chess) cannot contain the same digit. The grey line in the grid is a palindrome (ie the string of digits along the line must read the same forwards and backwards.)
Normal sudoku rules apply. Cells separated by a single knight's move (in chess) cannot contain the same digit. The grey line in the grid is a palindrome (ie the string of digits along the line must read the same forwards and backwards.)