Entry location: Mercenaries - Waterworld
Do you have trouble with the chainsaw maniac? If you do, you found the right place.
1st- Usually if you spawn on the wooden platform, the chainsaw guy will automatically come. Bust open the barrel at the top of the main platforms. There should be a hand grenade. Equip it and throw it at the chainsaw maniac. If it stuns him, unload your TMP on him. When he gets back up, turn around and go to the place where you can get the bonus time on top of the building. Toss a grenade down there and then it will stun him, watch your back while you unload on him. Note: There should be a red barrel that the grenade explodes, that helps to bring down his life.When he hops up to the top of the building, hurry up and run to the other side and toss some grenades at him. When he dies, go grab some time. Note: DON'T GO IN THE OPPOSING BUILDING! THE OTHER CHAINSAW GUY IS IN THERE! JUST CLIMB TO THE TOP, GRAB THE TIME AND DROP DOWN TO THE LITTLE WOODEN PLATFORM AND GRAB THAT TIME!
2nd- Basically just keep repeating this step for the next chainsaw guy and after you kill the second one, get a good combo (Last Note: After the second one, don't worry about another one coming, there is only 2 chainsaw guys)