Sum
Lanes

How to play Sum Lanes

Each puzzle is a sheet of white squares in lines. The navy square at the start of a line holds its total: an arrow after the number points across, an arrow under it points down. Put a digit from 1 to 9 in every white square so each line adds up to its total, and never use the same digit twice in one line. Every puzzle has exactly one answer.

Sum Lanes is our own take on Kakuro, the number puzzle also called cross sums. It starts with two squares and totals up to 10, then climbs to three in a line and 7 by 7 sheets with totals up to 24, so it is great practice for number bonds, adding and taking away. Like puzzles? Try Sum Pockets, Number Masks or our maths games.