Tasty Planet: Back for Seconds is game focused on the growth of a self-replicating blob of nano-machines, "Grey Goo." The levels follow the Grey Goo as it changes from eating dirt particles to bugs and leaves, and then eventually the rest of the universe. The game is arcade in style, and has both a casual mode, where players can play for leisure without a timer, and the full game which is timed and must be completed before the time runs out to complete the level. (wikipedia.org)