So a local retro arcade has a Dragon's Lair machine with what I assume is the PC DOS version of the laser disc.  It starts with the drawbridge scene and proceeds mostly linearly (some randomness, but not the way I remember from the arcade versions I used to play in the 80s) through the crumbling vestibule and various other "Castle" scenes, one nine floor falling elevator separating "Castle" from "Cavern" scenes and finally the dragon.  I thought, based on conventional wisdom, that I had the highest score possible on that machine (378,517).  I played perfectly, dying only on the last move and completing on the last life.  This particular arcade posts its high scores, and I thought I had the max score possible.  Recently, someone scored 442,938 or something like that.  The machine is set to 3 lives and was not apparently changed to 5 to achieve the additional points. Does anyone familiar with this version of the ROM know how this might have been achieved and is it beatable?  Was there a trick I didn't know about?  Does this ROM reward completing in one life with a super score (something I had not considered before)?  Any ideas are appreciated.