This is an easy way to unlock the "Super Hammer" cheat, which requires 100 kills with the sledgehammer. Go to dust near the chemical depot that is near the Badlands and take out a couple guards. Then, go back out of the depot and wait for cars to come by and take them from the civilians and the guerrillas. Form a wall using these cars with only two openings just large enough for people to fit through. Wait for the EDF to come in through the holes, then take out the sledgehammer and start bashing in heads. If they start trying to bash the car wall, blow up their cars. You can use the sledgehammer, but it will take awhile. Try using the explosives since the kills do not have to be in a row. Keep doing this until you have killed enough EDF. Note: Do not go into the chemical depot.