Gems have always been very valuable. In "Mission to Jupiter" they are essential for the journey. The game is simple, yet addictive. There are various platforms scattered throughout space with gems around them. Your job is to get all the gems without falling in to space. Do this by using the mouse to aim and clicking to jump. The height of the jump is also dictated by the mouse: moving further from your character gives a more powerful jump while moving towards him makes the jump less powerful. See how long you can last.