1-6 must be placed in each row, column and marked 3x2 region. Digits on the line π΄π΅π³πͺπ€π΅ππΊ π£π¦π΅πΈπ¦π¦π― the two circles sum to a two-digit number, where the "tens" digit is in one circle and the "ones" digit is in the other. Also, digits on the line, πͺπ―π€ππΆπ₯πͺπ―π¨ π΅π©π¦ π€πͺπ³π€ππ¦π΄, sum to a two-digit number, where the "tens" digit is in one circle and the "ones" digit is in the other.