From the manual OBJECT OF THE GAME On each level, construct an energy base, section by section. Add each section by moving your energy block in place and filling it with an energy blast. Work fast to complete a base before the nasties nibble it away. If a section gets nibbled, you must build it again. When you complete a base you advance to the next level. Protect your energy block against nasties who can destroy it. Shoot them down with energy blasts. Or neutralize them with special energy from an EPak. Don't run out of energy or you lose an energy block. Three energy blocks per game. When they're gone, the game is over.