: A single hit can destroy your ship and cost a life, though upgraded weapons will often degrade by one level instead of resulting in immediate destruction.

: You must manage your ammunition, starting with 100 missiles and collecting Missile Packs to replenish them during battle.

: The game uses a password system (e.g., LEVEL 2 is "DELTA-848") to allow you to resume your progress at specific milestones. Power-ups & Hazards : Shields : Provide 12 seconds of invulnerability.