I can only do it by killing the hedgehog twice. Jump over the first gap and knock the ball so it rolls left then quickly jump over it and down to get the first item then let the ball drop on you so you die. Then roll the ball over to get on the ledge and collect the other 3 items. Then knock the other ball out and let that drop on you so you die again and then you will come back to the checkpoint and then jump over to the end. Dont know how to do it without dying so I have only got 159 stars!