I had a copy of the Fortran IV source for the PDP-11 back in the late 70’s. My friend and I tried to extend the game a bit, but soon ran into trouble. Dunno whether this is the same code or not.
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That was me. On the engineering filesystem of GEISCO (General Electric Information Services Co Mark III foreground, the thing using Honeywell equipment that later became GEnie) ... still a kid I leveraged the debugger to root-like access for a time and it was fun. I did a global search for Adventure and found it in 4 separate 'private' employee-user places, and patched them all. ~1981.
Our plan was to let you say, “get nothing”, and then carry “nothing” to the Majestic View and drop it on the lava flow so that you could cross to a new area; but we only had 28k of memory and and had to abandon the idea,