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Moon or Sun (1152)
Instruction:
Draw a single loop that passes orthogonally through centers of cells. The loop cannot intersect itself or enter the same cell more than once.
For each outlined region, the loop must enter it exactly once (that is, for each region, all used cells must be consecutive along the loop's path) and must go through at least one cell with a symbol.
For each outlined region, the loop must either enter all cells with a moon symbol and no cells with a sun symbol, or enter all cells with a sun symbol and no cells with a moon symbol. When the loop leaves one outlined region and enters another, the symbols that the loop goes through in those two regions must be different.