Successfully complete all challenges to unlock the Sneaking Suit.
Use the following trick to deliver a flurry 3 by hiding and get an "A" rank. When the mission begins, veer left to the truck near the two men busy sawing the log. Wait until the man sawing on the far left hand side is as far away from you as possible. Press Y to climb in the truck. The hungry woman closest to you will faint, but stay in the truck. Behind you a woman will come around the ramp. By the time she is near the truck she will be hungry. When the screen indicates, press A for 20,000 points and an "A" rank.