A nonogram is a type of Japanese logic puzzle.
The objective is to complete a picture in a grid by using logic:
the numbers tell you how many black squares there are in each row and column.
When e.g. the numbers next to a row read '2 3' this means the row contains 2 and 3 consecutive black cells from left to right.
The picture is finished when all constraints are met.
When you click a black cell it turns white, a white cell turns black
So start clicking to discover the picture!