It's a hard game to explain without sounding silly. Picture a physics playground. You control a pink worm with feet named BOY, and move, eat objects to stretch your stomach, jump to any height you choose, and stretch lengthwise by pulling yourself in opposite directions, without any specific objectives. Then after you stretch BOY for a while, you can "report" how many meters you stretched to GIRL, causing her to stretch as well. But while BOY is a reasonably-sized character with an elastic torso, GIRL is a giant who starts life in Earth's orbit in space, and as everyone playing on PlayStation Network cumulatively reports stretching scores, GIRL grows bit by bit, eventually stretching herself from Earth to The Moon, Mars, Jupiter, etc. (and in the process unlocking these settings for all players).