Summandum (from Latin, "summarize") is a square grid with numbers in some cells. The aim is to place numbers from 0 to N across the top and down the left of the square grid. A number in a cell indicates the sum of numbers outside the grid in the corresponding row and column.
Cross+A peut résoudre les puzzles de 4 x 4 à 21 x 21. Puzzles sont enregistrés sous les fichiers avec l’extension *.SMDM.