I think this is the source code for this and others, in RPG (!): http://www.jcrcmds.com/jcrcmds6.txt
RPG is what most end-user i applications are written in, so it’s not very surprising.
No, I agree, it’s just noteworthy to see it used for games.
I’ve seen an ELIZA written in TECO. People will use what they have.