It's Sudoku Sunday! Continuing through the Level 2 puzzles we've reached No. 15, which is a triangular number because it can be represented as a triangle with equal sides.
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Sudoku Sunday! (Puzzle 15)

It’s Sudoku Sunday! Continuing through the Level 2 puzzles we’ve reached No. 15, which is a triangular number because it can be represented as a triangle with equal sides. Remember this…

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