Everything I have tried has not worked due to the guy with the red mask. I have 2 masters working on it and have hit the the red mask dude with lightening, twice then bees as I don't have enough power left for 3rd strike and still they have only completed around 20% before he is bk chasing them away. I occupy the 5 yellow masks [thats another thing i haven't figured out yet how to convert them ] with the children to try and give them free rein to get it done, but they are way to slow.