Draw one closed loop through the centres of cells, visiting every pearl.
At a black pearl the loop turns a corner, then goes straight through the next cell on both sides — so it cannot turn again right after the pearl.
At a white pearl the loop goes straight through, and turns in the cell just before or just after it (or both).
Black pearl
The loop turns a corner on it, and goes straight through the next cell on both sides.
✓ Correct
A corner on the pearl; both lines go straight through the next cell, and only turn after that.
✗ Wrong
No corner on the pearl. A black pearl is always a corner.
✗ Wrong
A second corner in the very next cell. Each line must go straight one more cell first.
White pearl
The loop goes straight through it, and turns a corner in the cell just before or just after it (or both).
✓ Correct
Straight through the pearl, with a corner in the cell just before it.
✗ Wrong
A corner on the pearl. A white pearl is always passed straight through.
✗ Wrong
Straight through, but no corner in the cell just before or just after it.
Draw one closed loop through the centres of cells, visiting every pearl.
At a black pearl the loop turns a corner, then goes straight through the next cell on both sides — so it cannot turn again right after the pearl.
At a white pearl the loop goes straight through, and turns in the cell just before or just after it (or both).
Black pearl
The loop turns a corner on it, and goes straight through the next cell on both sides.
✓ Correct
A corner on the pearl; both lines go straight through the next cell, and only turn after that.
✗ Wrong
No corner on the pearl. A black pearl is always a corner.
✗ Wrong
A second corner in the very next cell. Each line must go straight one more cell first.
White pearl
The loop goes straight through it, and turns a corner in the cell just before or just after it (or both).
✓ Correct
Straight through the pearl, with a corner in the cell just before it.
✗ Wrong
A corner on the pearl. A white pearl is always passed straight through.
✗ Wrong
Straight through, but no corner in the cell just before or just after it.
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