You may be forgiven for thinking this game is all about jigsaws, but the connection is only a loose one. Instead you have to fit the shapes into the grid so that the grid is complete. In the early levels you simply drag the shapes on, but at the levels progress you're given extra power-ups, such as 'rotate left' or 'flip' which you can drop onto the pieces first, before dragging them into the grid.
It's a lovely concept and I had fun working through a good number of levels.