The manual mentions there are secret places on each world that when shot at will reveal items and bonus points, but its unknown where exactly they are.

BUG: The manual mentions, "A single alien entity controls the other alien lords.  When you have destroyed the four worlds, the Sentinel will come face to face with this evil entity.  Defeat the final evil to complete your quest!"  However, when you destroy the fourth world, the game simply ends.  {Scott Stilphen}

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