How do you beat ripper roo on crash

easy! first after 3 boxes have fallen its the silver box, after 5 boxes have fallen its the silver one then after 9 boxes have fallen its the silver one! and if you wanna kill him you have to do space bar when the silver boxes are coming then he will loose life when you have done 3 silver boxes you have done! and when you have done you have defeated RIPPER ROO! but i call him RIPPER POO