Ham 'Em High 13-15 is the final level of the second theme of Ham 'Em High. There is an achievement for Ham 'Em High 13-15, with Clint Eastbacon (a pun on Clint Eastwood). The Moustache Pig will be defeated when you defeat him.
Fire Big Brother straight ahead. It may take a few tries, but there’s a soft spot so that Brother can make it half way through the structure, causing major destruction. Use the Boomerang bird to attack the right side of the level from behind, then fire another Brother forward to pop all remaining pigs.