Normal sudoku rules apply. A friendly cell has a value identical to its row-, column- or box-number, counted in the standard way. The green "lawn" cells are friendly. (For example, r1c7 must be either 1 to match the row, 3 to match the box, or 7 to match the column.) Additionally, an orthogonally-connected one-cell wide path (so the path cannot touch itself orthogonally) must be found between the cells marked with circles, such that every cell on the path - including the marked cells - is friendly but not lawn. (Note: there could be friendly cells other than path or lawn in the puzzle.) Along the marked arrows, the digits in the friendly cells (any friendly cells - whether lawn, path, or otherwise) sum to the same total as the digits in the cells that are not friendly.
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