Thunderground [Model 003-01]

Thunderground © 1983 Sega Enterprises, Limited.

Destroy all enemy nuclear bases located on the planet surface. Bases are protected by two deadly 'Core Ranger Tanks' standing guard beneath the enemy base force field. You must outmaneuver or eliminate tanks, strip away the force field with your core capsule, then shoot the bases with your atomic laser cannon. Careful planning can force the blue enemy 'Digger Tanks' to strip away the force field for you. But you must hurry. You only have a limited amount of time to complete the mission or you'll lose one of your reserve core capsules.

You are faced with 12 levels of difficulty with four rounds per level. A round ends when all six bases on the surfaces have been eliminated. After level 1, the difficulty increases with bases appearing one at a time. The last or sixth base in a round is displayed in multiple colors.

Enemy supplies are hidden on the playing field during each round. Uncovering these supplies with your core capsule will give you bonus points. Their location is random. But, careful observation may reveal a secret as to their position.