The Logic Puzzle was first introduced in 1888 by McLoughlin Bros of New York (originally called Giant Puzzle).
It is a bit like Sudoku, and is quite difficult. The object is to arrange all the pieces in the base so that no color repeats on any row, column, or any diagonal. Also, no number can be repeated on any row, column or any diagonal, and each row, column and major diagonal must add to 25. To tackle easier tasks to warm up your brain, you might try to tackle each of the requirements separately (that is, just work on colors, or just work on numbers, or just work the 25 addition) before you take on the full challenge of making them all happen at once!
Hardwood construction, 5.5in x 5.5in x 1.25in.
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