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Math meets Sudoku! Fill a Latin square where cages provide arithmetic constraints. Created by a Japanese math teacher, loved worldwide.
You understand markets. Now trade them.
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Fill the grid so each row and column contains 1–N exactly once (like Sudoku). Each cage (outlined group) must satisfy its arithmetic constraint (e.g., "6×" means cells multiply to 6).
Start with single-cell cages (they're given). Then look for cages where only one combination works. Use elimination within rows and columns.
Park, J. & Brannon, E.M. (2013). "Training the approximate number system improves math proficiency." Psychological Science, 24(10), 2013-2019.