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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