Masyu Slitherlink Instructions

Rules: The challenge is to draw a loop around the grid, subject to the following rules:

1. White circles must be travelled straight through, but the loop must turn in the previous and/or next intersection in its path.
2. Black circles must be turned upon, but the loop must travel straight through the next and previous intersections in its path.
3. Numbers in the squares represent how many of its four sides are part of the loop.
4. The loop mustn't cross or branch off.