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Balance Loop (Star Battle) (1214)
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.
The loop must go through all cells with a provided symbol or number. For each cell on the loop, consider an "arm" to be the loop segment between the center of that cell and the next or previous turn in the loop; each cell therefore has two arms. A white square in a cell indicates that its two arms are of equal length; A black circle in a cell indicates that its two arms are of unequal length. A number in a cell indicates the sum of the lengths of its two arms. (The length of an arm is considered to be the number of cell borders it goes through.)
Also, place stars into some cells in the grid, no more than one star per cell. Each row and each column must contain exactly two stars. Cells with stars cannot touch each other along an edge or a corner.
The loop cannot go through any cells with stars.