Some squares hold an arrow and a number. Every other square is either shaded or part of a single closed loop that runs through square centres, turning at right angles, and never crosses or touches itself.
Shaded squares may not touch along a side. Each arrow’s number tells you how many shaded squares lie in a straight line in the arrow’s direction, all the way to the edge. Clue squares themselves are neither shaded nor on the loop.
Start with zeros — every square in that direction is on the loop — and corners, where the loop has only one way to turn.
Shade some squares and draw one loop through all the others, so that arrows count the shaded squares in their direction and shaded squares never touch.
The full guide, with a worked example and common mistakes: How to play Arrow Loop.
No — the count runs all the way to the edge; clue squares along the way are simply skipped.
No — clue squares are neither shaded nor on the loop.
Yes — every puzzle here is checked to have exactly one solution.
Open the Arrow Loop Solver, enter the clues and press Solve.