Heli Attack 3/Zone 2-4

Helicopters to destroy: 6 Bomber Helis 4 respawning Robots

Tactics
Attack the helis with any weapon apart from the soundwave, black hole generator or atom bomb, they should be kept for the final levels, but use them if you get into trouble. To dodge the bomb attack, hyperjump and use time break and you should not take any damage, after you dodge it, follow the helicopter for a lot of free shots while it bombs the ground. If the helis are not using the bomb attack, you can usually just run from right to left without taking any damage.

-- In this zone, either use the same tactic in the zones 2-1, 2-2 and 2-3 (Bomber Helis need 6 grenades to be taken down) or you can use some spare bad weapons to make it easier to use better weapons. For me the worst weapons(except the initial weapons,Grenades(x25 each round), Pistol, Knife and Bow & Arrow(all 3 are infinite)) are: Any other weapon can do great damages to an attack heli, the biggest and strongest of all helis, with an average of 5-10 second to kill an attack heli. Even black hole generator can kill a heli less than 10 seconds at average, because it can suck up 2 helis in one shot. Cool, huh? --
 * Shotgun
 * Double Shotgun
 * Machinegun(yeah, you should have plenty of machinegun ammo right now you won't have to get even more so feel free to use it)