In Blopper you'll have to pop as much balloons as possible with your darths. Throw the darts in the air and let them pop the balloons, smaller balloons give more points. There are 3 types of bonus-balloons, which will give you time, extra darths or extra speed.
To advance in levels, a minimum score is set per level, if you don't reach that score, you'll lose a life. You start with 3 lives.