Digits along a line must have the same sum as the two digits in the bulbs at either end of that line.
Some lines are colored red and blue solely to distinguish the paths of the lines.
Try the Double Arrow puzzle on the CTC App
Solution code: Column 9
on 5. June 2023, 23:53 by tallcat
Very clever opening sequence and a smooth path through afterwards!
on 4. June 2023, 17:29 by Crusader175
Very nice!
on 4. June 2023, 15:38 by Jlrice2
Tough break in but flows pretty smoothly afterward.