Contained within the grid are nine non-overlapping 3x3 square regions, which must be located. Each region contains the digits 1 to 9 once each, such that no digit repeats in any row or column. Cells outside regions do not contain digits. Pink lines must contain a set of consecutive digits in any order, with no repeats. Cells on a pink line that are outside any regions, as noted above, do not therefore contribute towards that line's set. Circled cells indicate the number of cells from their respective region that that particular pink line passes through. For example, if r3c3 were 6, then its region would need to cover the entirety of that pink line. Any given pink line could contain no digits at all. Every circle contains a digit.