iPhone app Masyu puzzle

Masyu is popular puzzle game in Japan.

Masyu is played on a rectangular grid of squares, some of which contain circles; each circle is either white (empty) or black (filled).
The goal is to draw a single continuous non-intersecting loop that properly passes through all circled cells.
The loop must enter each cell it passes through from the center of one of its four sides and exit from a different side; all turns are therefore 90 degrees.

The two varieties of circle have differing requirements for how the loop must pass through them:

White circles must be traveled straight through, but the loop must turn in the previous and/or next cell in its path;

Black circles must be turned upon, but the loop must travel straight through the next and previous cells in its path.,

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