for lvl 15 if you are having some trouble:
you need to stun the first ghost while going through it. next you need to go to the 2 bats and eat the one on the left while the second ghost is moving down. you should be able to get in the hole on the left. then jump on the second bat and eat your last person
 "Woodclicker"){kind=icon}
 "Greedy Mimic"){kind=icon}
 "Brain Diet"){kind=icon}