31/01/2013 - Zero (**)

This puzzle is rated 2 star (medium).

Description

Create a triangle with 4 squares on each side (9 squares in total) like the one shown above.

Puzzle
Put the number -4, -3, -2, -1, 0, 1, 2, 3 and 4 into the squares so that each side equals 0.

Check the solutions page for the correct solution.