Puzzle #57 - Dissected Loop

This is the second of two puzzles that I made for a prompt themed around "broken" puzzles. I think it's quite a fun solve, but be sure to read the rules carefully.

Rules

Assemble the four pieces into a 20x20 grid and then draw a single non-intersecting loop through the centres of some cells that obeys the rules for each quadrant. The pieces may be rotated, but not reflected, and their relative order may not be changed (that is, the top-left piece must stay in the top-left, and so on).

Masyu (top-left): The loop must pass through each cell containing a circle. The loop must turn on black circles and travel straight through the cells on either side of the turn. The loop must go straight through white circles and turn in at least one of the cells on either side.

Regional Yajilin (top-right): Cells in this quadrant which the loop does not pass through are not permitted to share an edge. A number in a region indicates the number of cells in that region through which the loop does not pass.

Ovotovata (bottom-left): The loop must visit each shaded region at least once. When the loop exits a clued region, it must travel in a straight line until the Nth cell and then turn, where N is the value of the clue. A question mark can represent any positive integer.

Balance Loop (bottom-right): The loop must pass through each cell containing a circle. The two segments extending from each white circle must be of equal lengths, and those extending from each black circle must be of unequal lengths. A number inside a circle indicates the total length of the two segments extending from the circle.

Note: if solving this puzzle online, the easiest way to approach things is to use the blank grid and manually copy over the pieces whose orientations have been determined.

Difficulty: 8/10





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