You get the idea, right? This is pretty standard adventuring fare in an underground fantasy world populated by wizards, giants, dragons and a fish!
Pages 37 to 74 present the program in fragments, along with explanations of what's going on for budding adventure programmers. If you enter the lines of BASIC code as presented, you will have to delete some of the lines and re-enter different lines as the explanation progresses. This is a real pain if you just want to play the game. In this case, the full program listing is presented on pages 251 to 265.
Unfortunately, both the fragmented and full listings are missing two lines. The missing lines cause a UL (undefined line) error when you try to DIG, so that it is impossible to complete the game. To fix this, add the following lines:
1335 GOTO 1440
1340 IF I(2)=0 THEN 2740
There are also a few other minor spelling or grammatical errors that are awkward to correct because most of the text is encoded.
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