DK>I recently got Terminal Velocity in the Megapak 5, I've been enjoying
  >it, but I finished mission 6-3 and suddenly I was back at mission 4-1.
  >Is something wrong, or does the game just fail to have an ending?
Something must be seriously wrong! There are like 10 planets, and there 
is an ending.
DK>I also noticed there was a file (GEIGER.VOX, I think) which mentions
  >a secret level...  How does one get to it?
I think it's a secret planet, (3 levels) it tells you a special login 
to start at the secret planet.
 Josh McKinnon
 * 1st 2.00 ~ The 4 food groups: Fast, frozen, instant and microwaved.
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