I always finished Space Quest 6 with 498 points. Some people said that the maximum possible points are 500.
There is a points list here:
http://www.spaceques.../sq6/pointlist/
But there are two mistakes:
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Go to the Orion's Belt and kick in the basement door - 1
I can't get this 1 point.
Only this one works:
Open the basement door - 3
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Untangle the hookah hoses - 3
I only got 2 points for this action.
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The maximum possible points are 498 or 500?