The mysterious "ultimate defense." So mysterious, that the creator of the game didn't even know what to call it.
|Weapons | Defense | Intelligence | Security | Radar|
|Levels 1-5||Sand Mounds | Barbed Wire I | Barbed Wire II | Sandbag Walls I | Sandbag Walls II|
|Levels 6-10||Electric Fence I | Electric Fence II | Lava Moat I | Lava Moat II | Radioactive Walls I|
|Levels 11-15||Radioactive Walls I | Ion Fence I | Ion Fence II | Force Field I | Force Field II|
|Levels 16-20||Missile Defense I | Missile Defense II | Nuclear Defense I | Nuclear Defense II | Ultimate Defense|
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