A game of chance involving gathering the ingredients for life and determining if life evolved by assembling a puzzle. Life, as we know it, is known only on Earth.
Earth is unique in our solar system in having liquid water on the surface.
The Galileo spacecraft is taking images of Europa to search for evidence of liquid water beneath the ice. One way to think of this is to compare the formation of life to baking a cake. You need flour, eggs, sugar and water for a cake. The ingredients must be carefully measured, combined and properly prepared. So it is with life.