Ok, here's the walkthrough to finish Maniac Mansion from this saved
game:

   When you load this saved game, you'll be controlling Bernard. Walk 
Bernard through the door in front of him, and walk towards the right half 
of the next room. The purple tentacle will attempt to capture you, but
Weird Ed will get you out. Open the door at the end of the ready room,
walk to the right side of the lab, open the locker and pick up the 
radiation suit. Use the card key in the card slot by the door nearest
the locker. Go into the meteor room and turn off the switch close to the
door. After the short sequence, walk to the end of the room and pick up
the meteor. Open the door that was near the meteor and put the meteor in
the trunk of the Weird Edsel (Use meteor with trunk). Close the
trunk and use the yellow key in the Edsel.

        CONGRATS!! YOU'VE FREED SANDY AND WON THE GAME!!


        Thanks to LucasArts for making such a cool game. Check out the
        awesome sequel to Maniac Manision: "Day Of The Tentacle". This
        one is even funnier than the first and includes a few new surprises!


