Refresh Challenge Challenge: Finish Unit (col) Finish Unit (row) Finish Unit (blk) One Spot (col) One Spot (row) One Spot (blk) One Digit in Spot Subrow in Block (spot) Subrow in Block (digit) Subcol in Block (spot) Subcol in Block (digit) Subrow in Row (spot) Subrow in Row (digit) Subcol in Col (spot) Subcol in Col (digit) Naked Pair (spot) Naked Pair (digit) Hidden Pair (spot) Hidden Pair (digit) PuzzleStr: