**Factorism** (*"Find the Factors"*) is a logic puzzle invented by Iva Sallay (USA). The goal is to place numbers from 1 to N across the top and down the left of the square grid **N** x **N**. A number in a cell indicates the product of numbers outside the grid in the corresponding row and column.

**Cross+A** can solve puzzles from **3 x 3** to **30 x 30**.