Hide underground:
Fire a Digger at a steep angle so your tank slides down into the ground. Use a dirt weapon to seal yourself in.

Easy points:
The easiest way to get over 100 points is to shoot a cannon ball on a mountain so that it rolls downward and hits him.

Bouncy Dirt and Fission Bomb combo:
Cover one side of the interior of a large crater with Bouncy Dirt and hit the tank with a Fission Bomb while it is at the bottom of the hole. Note: Try using Mountain Movers and Crater Makers.

Pile Driver and Hailstorm combo:
Hit the tank with a Pile Driver followed by a Hailstorm (or Napalm).

Ground Shocker and Popcorn combo:
Fire a Ground Shocker directly below your opponent's tank to make the ground very rough. Then, fire a Popcorn nearby and the bullets will bounce and multiply.

Accuracy
Quick and easy shot accuracy...Always keep the power at 100, or around there...With the power at 100, it is easy to find out where to put the angle...I always start out at 90(straight up) and count each degree that way...If you over shoot it, change the degree's a little bit, and at least you know next time its not that degree...Ex. I shot 88 degree, and it landed 5 tank lengths from it, i move the degrees +/- 5 degrees