The aim of the game is to place each colour and each number once on each row and each column, with different colour/number combinations.

Features:

Days of fun with challenging brainteasers
Put different colours and numbers on each row and column
Only use one Red 1, Red 2 and so on
Puzzle sizes of 3, 4, 5 and 7
Puzzles on Easy, Medium, Hard and Expert difficulty levels
280 levels in this version
Based on Greco-Latin squares invented by the famous mathematician Leonard Euler