After doing sides go to second from bottom line and do the 3 blue.... this will put them in a line... Sorry forgot to put that in the above post

start straight across top 5 green. usually u will be able to do another 5 green in green section. Next go to sides and do the 4 intermost paint monsters ( 3 edge 1 middle ) do both sides. This will give you enough monsters to complete level and about half the required amount in a row close to bottom. At top make as many blast guys as u can until the square guys become the round headed guy.. Make sure and make a sideways blast for all those ones in a line then just pick off the rest. It took me about 8 trys but I got it with 3 stars to boot..