Can't Spell Index Without X
- X-sums
- Indexing lines
The brief
- Normal sudoku rules apply, i.e. each row, column and 3x3 region has to contain the digits from 1 to 9 once each.
- Index Lines: Each turquoise line is an Index Line, i.e. the digit in the Nth cell along such a line (starting from the diamond) indicates the position along the line where the digit N appears. For example, if a diamond cell contains a 3, the third cell along that line must have a 1.
- X-sums: Clues outside of the grid are X-sum clues, i.e. the numbers indicate the sum of the first X digits in the respective row or column where X is the first digit seen from the clue. An odd/even clue only indicates the parity of the respective X-sum.