How to solve Yajilin
Shade the dead ends, let the arrows count, and give every loop cell exactly two lines. The loop draws itself one forced segment at a time.
How it works
Yajilin gives you a grid with some arrow clues. You shade some cells and draw one loop through all the rest.
Shaded cells never touch side to side. An arrow clue counts the shaded cells in its direction, all the way to the edge. Clue cells are neither shaded nor on the loop.
Every other cell is on the loop, which passes through it with exactly two lines. Every puzzle here has a unique solution, reached by logic alone.
An order that works
Start at the edges and beside clues: cells with one open side are dead ends, and every shaded cell makes its neighbors loop cells.
Then read the arrows. A 0 makes every cell in its direction a loop cell. A big number in a short line leaves little room.
After that, follow the loop. A loop cell with two open sides uses both. A loop cell with two lines closes its other sides. When two line ends could join early, keep them apart.
Worth memorizing
One open side means shaded.
The loop needs two ways through a cell.
Shaded cells never touch.
Every neighbor of a shaded cell is on the loop.
Each loop cell has exactly two lines.
No small loops: there is only one.
Practice
0 of 4 rightAt the start, what is the ringed cell?
What is the ringed cell?
Using the arrow beside it, what is the ringed cell?
Can the loop use the ringed side?