Yajilin

Draw one closed loop through the empty cells, and shade the cells it skips.

A grey cell’s number is how many cells are shaded in its arrow’s direction. Clues are never shaded or on the loop.

Shaded cells never touch side to side - only at their corners.

One continuous line, passing once through every cell that isn’t shaded or a clue.

Exactly one solution, always reachable with logic - never a guess.