This is volume 1 in a series of challenging TripleCross puzzles.
A TripleCross is like a crossword, but uses numbers instead of letters.
Each digit occupies a hexagonal cell and can be part of a "word" in the across, up, and down directions.
Each clue is a mathematical relationship with other clues. For example, a puzzle might have the clue that 1 Across equals 4 Up plus 6 Down.
Visit http: //3DMathPuzzles.com to download free TripleCross, CrossFigure, and 3D puzzles!
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