description Sum Frame Sudoku Overview
Sum Frame Sudoku is a Sudoku variant in which numerical clues are placed outside the grid. Each clue gives the sum of the first three digits encountered in the corresponding row or column when read inward from that side, adding arithmetic constraints to the standard placement rules. Solvers use those sums together with ordinary Sudoku deduction to determine both the edge entries and the rest of the grid.
help Sum Frame Sudoku FAQ
How do the outside clues work in Sum Frame Sudoku?
Each outside clue gives the sum of the first three digits encountered when reading inward along a row or column. The clue therefore adds an arithmetic condition to the normal Sudoku rules.
Do Sum Frame Sudoku clues apply to the whole row?
No. A clue concerns only the first three cells seen from its side of the grid. A clue on the left can therefore constrain a different three-cell group from a clue on the right.
What standard Sudoku rules still apply in Sum Frame Sudoku?
Digits must still follow the usual Sudoku placement rules for rows, columns, and boxes. The outside sums add another layer of logic rather than replacing those rules.
What makes a Sum Frame Sudoku harder than ordinary Sudoku?
You must combine digit-placement logic with short arithmetic equations. For example, a clue of 9 means the first three inward-facing digits must total 9, which sharply limits their possible combinations.
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