In Tri-Heli II the player pilots a chopper and must collect diamonds that are buried in the ground. To reach the diamonds the player must use the choppers gun to blast holes in the ground. But once the player starts to "dig" a plane that flies at the top of the screen will start dumping dirt over the hole to fill it up. Once a diamond has been collected the player must return to the helipad before picking up another diamond. When enough diamonds has been collected it's of to the next level. The ground level varies between levels. To add to the difficulty guns will drop from the sky from time to time. Once these hits the ground they will start firing.