Walkthrough by Bruce A. Smith

Zork: The Undiscovered Underground is a short text adventure written \as a prelude to the graphic adventure Zork: The Grand Inquisitor.

Whenever your lantern goes out simply "HIT LANTERN," 
which gives you 5 points the first time you do it.

New Excavation

NE. 
E. 
E. 
E. 
E. 
OPEN TRUNK. 
GET COIN. (5 points.) W. 
W. 
W. 
S. 
S.
GET TREE. 
EXAMINE TREE. 
GET TINSEL.
N. 
E. 
TIE TINSEL TO COIN. (8 points.) 
PUT COIN IN SLOT. 
GET COIN. 
PUT COIN IN SLOT. (10 points. Note which rib the busts tell you to pry.) 
W.
N. 
N. 
NW.

Souvenir Stand

TALK TO SALESMAN. 
GET MASK. (8 points.)
GET RUNE. (1 point.)
GET MULTI. (1 point.)
GET ZM$100000. (1 point.)
GET FOREVER. (1 point.)
N. GET RAZOR GLOVES.
GET FUR SUIT. 
GET FISH MASK. 
S. 
SE. 
WEAR MASK. 
WEAR GLOVES. 
WEAR SUIT. 
DROP LANTERN. N. (10 points.)

Convention Hall

GET SHOES. 
GET GLASSES. (5 points.)
S. 
GET LANTERN. 
EXAMINE SHOES.
S. 
E. 
E. 
GET RED LENS. (5 points). 
GET BLUE LENS. 
W.
W. 
DROP $ZM10000. 
S. 
DROP FOREVER. 
W.
PRY (Use clue from busts) RIB WITH SWORD. (5 Points.) 
SW.
GET CAN. (5 points.) 
NE. 
E.
S.

Mud Forum

PUT RED LENS IN GLASSES. (5 points.) 
PUT BLUE LENS IN GLASSES. 
WEAR GLASSES. 
DROP ALL. 
OPEN COVER. 
PRESS BUTTON. (10 points. Note order of objects.) 
GET ALL. 
DROP MULTI.
PUT FLATHEAD ON CIRCLE. 
PUT TREE ON SQUARE. 
PUT HOUSE ON TRIANGLE. 
PUT BALLOON ON PENTAGON. (5 points.) 
SE. 
DROP RUNE. 
WAIT. 
NW. 
N. 
N. 
W. 
SW. (10 points.)

You scored 100 out of a possible 100, in 80 turns,
earning you the rank of The Ultimate Infocom Text Adventurer.
Congratulations!