You start each puzzle with an empty grid and numbers along the side of each row and column. Each number represents a line of blocks that must be filled in somewhere along the line. Where there is more than one number per line, the filled in blocks must be separated by at least one space.
You must use logical deduction to work out which blocks are safe to fill in. If you fill the wrong blocks then you receive a time penalty. When all of the correct lines have been filled in, a picture is revealed.
The puzzle grids start out small, but as you progress they get bigger and more difficult.
To make the game even more challenging, you have to complete each puzzle within a time limit. You receive increasing penalties for making mistakes and a five-minute penalty for requesting a hint.
