A loop-drawing puzzle. Draw a single continuous, non-crossing, non-branching loop along the grid lines so that every numbered cell has exactly that many of its four sides on the loop.
Rules
Click a space between two dots to draw a line there; click again for a ✕ (definitely no line), once more to clear it.
Every numbered cell must end up with exactly that many of its four sides drawn.
The finished lines must form one single loop — no branches, no crossings, no loose ends.
A dot with three or more lines, or a cell with too many, is shown in red.
Tips
Start from the 0s and the highest possible clue (3 on a normal board) — a 0 rules out all four of its sides immediately, and a 3 forces three of them in.