you travel around as a blob, you pick up color in fountains and paint surfaces by making contact them them, you get combos by linking jumps from 1 structure to another and by jumping and crushing enemies. when you get hit by an enemy they willturn you black or brown which will not score any points. you then need to go ans wash off in a water fountain which will make you clear/transparent. you then need to go and get a color again before you can start painting again. you have to do certain puzzles like painting specific things different colours and being a certain color when your exit appears. you have a certain time limit to somplete a stage and you need to complete a certain # of points before the exit appears. the more points you get the larger you get also (paint more surface area). its like a puzzle/platformer.
you can check it out on
Nintendo Wii there is a hands on impressions article that explains the game.