Shoot the bad guys that are occupying the tower. Be mindful of the civilians.
Throw pies at all the bad guys as soon as they appear in the windows of the tall flat. Hit them quickly, before they can line up their own pies and throw back.
You will have to react quickly, but do not forget to look carefully first.
You have to hit the bad guys; the killer clowns, the demons, the thieves, etc. There are also policemen and little old grannies living the in flat. Make sure you do not hit them by accident. Have fun playing