The premise is simple. A line of coloured marbles rolls its way ever closer to a skull in the game play area and once they reach it the skull consumes the whole line and one of your initial 3 lives is lost. In order to stop this happening you control a frog in the middle area that shoots out coloured marbles. Aim these at matching colours in the line and any groups of 3 or more you create disappear. Careful timing can create combos of like coloured marbles that attract each other. There are also various power ups throughout the line that have an effect on the game from slow down, reversing of direction or blowing up a section of the line.