Pick a bubble in the Gallery, then move your mouse or finger across the board. Wherever you pass, a bubble splits into four smaller ones with a sharper piece of the picture.
There is no time limit and no way to lose — just keep sweeping until the whole picture is revealed. Finished pictures show up in the Gallery as revealed thumbnails.
Prefer tapping? Tick Click to pop under the board to pop one bubble at a time.
More about each mode on the About page.