數和方塊數獨 Quad Sums Sudoku (非全標)

規則：在空格中填入1∼9，使得每一行、列、宮中的數字都沒有重複外；標示處周圍4數中有一個數為其它3數之和，未標示處無限制。
rule：Apply classic sudoku rules. A circle at a corner implies that one digit is the sum of the remaining three digits at that corner. Not all possible dots are given.
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解答：
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數和方塊數獨 Quad Sums Sudoku (全標)

規則：在空格中填入1∼9，使得每一行、列、宮中的數字都沒有重複外；標示處周圍4數中有一個數為其它3數之和，未標示處不得出現上述情況。
rule：Apply classic sudoku rules. A circle at a corner implies that one digit is the sum of the remaining three digits at that corner. All possible dots are given.
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解答：
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