After a night of celebrating, our hero leaves r1c1, through the fog, trying to get home to r9c9. With each step, they move to an orthogonally adjacent cell, forming a modular line as they go. (This means that any set of three contiguous cells along their path must include one digit from [147], one digit from [258] and one digit from [369].) They stagger from streetlamp (yellow circle) to streetlamp along the way. Some of the streetlamps are visible from the start but others are hidden by the fog and will only be revealed when correct digits are placed nearby. Their path must lead them to every streetlamp. All streetlamps are from the same modular set and, whenever a number from that set is on the path, it appears as a streetlamp. Numbers from that modular set which are not on the path are not streetlamps. In cages, digits cannot repeat and must sum to the small clue in the top left corner of the cage (if given). If our hero enters a cage, they must completely traverse the cage before exiting it. Some killer cages may be avoided entirely.