Today’s puzzle might be somewhat vulnerable to metalogic due to the sparse clues, but I think the actual logic involved is pretty interesting.
- Draw a single non-self-intersecting loop that runs through the centers of the cells and visits all pearls.
- On black pearls the loop must make a right turn, and the loop must go straight through the cells before and after the pearl.
- On white pearls the loop goes straight through, and the loop must make a right turn on at least one of the cells before and after the pearl.
- Or, see Masyu rules.
- Additionally, the loop must alternate between visiting black and white pearls: it can’t visit two pearls of the same colour in a row.