Zork: The Undiscovered Underground

This game was released at the same time as Zork: Grand Inquisitor as a prequel to the graphically superior game.  It's available for download at the Activision website I believe.

A hint page is available from the Zork area of Activision's web site if you visit the Telegraph Office, zoom in on the file cabinet and click on the upper (closed) drawer.

Walkthrough

Note: If your lamp goes out, shake it to bring it back to life (worth 5 points the first time you do it)
Start at New Excavation
NE to Tunnel
TASTE BOULDER
E N NW to Souvenir Stand
TALK TO SALESMAN
TAKE MASK (8 points) - note grue's description:
 

bulletGlowing fur
bulletFishy face
bulletRazor fingers

TAKE FOUR CANDY (4 points)
N to Changing Room
DON RAZOR
DON FISH
DON FUR
S SE to Convention Center Lobby
DROP LAMP
N to Convention Hall (10 points)
TAKE GLASSES (5 points)
S to Convention Center Lobby
TAKE LAMP
S to Cultural Complex
DROP RUNE
E E to Stage
TAKE BLUE LENS (5 points) - while wearing gloves
TAKE RED LENS
PUT BLUE LENS IN GLASSES (5 points)
PUT RED LENS IN GLASSES
E to Backstage
OPEN TRUNK
TAKE COIN (5 points)
W to Stage
SHAKE LAMP (5 points)
W W S to Hall of Science Lobby
DROP GORES
S to The Mud Forum
EXAMINE TREE
EXAMINE BALL
TAKE TINSEL
EXAMINE COIN
TIE TINSEL TO COIN (8 points)
N E to Museum of Illusion
PUT COIN IN SLOT
PULL TINSEL
PUT COIN IN SLOT (10 points)
Note the rib number in the oracle's message (e.g., sixth, first, etc.)
W W to Museum of Adventure
PRY nTH RIB WITH SWORD (5 points) - from oracle's message
SW to Janitor's Closet
TAKE CAN (5 points)
NE E S to The Mud Forum
DON GLASSES
DROP EVERYTHING
OPEN LID
PUSH BUTTON (10 points) - note front-to-back order of objects:
 

bulletFlathead
bulletTree
bulletHouse
bulletBalloon

EXAMINE SYMBOLS
 

bulletCircle
bulletSquare
bulletTriangle
bulletPentagon

TAKE EVERYTHING
PUT FLATHEAD ON CIRCLE
PUT TREE ON SQUARE
PUT HOUSE ON TRIANGLE
PUT BALLOON ON PENTAGON (5 points)
DROP ZM$1
SE to Cage
DROP MULTI
NW N N W to Tunnel
WAIT
W
Final score: 100 points

5 fixing the lantern
8 seeing a grue
10 impersonating a grue
8 decorating a coin
10 consulting the oracle
5 opening the massive door
5 opening the closet
5 choosing a lens
5 experimenting with the glasses
10 revealing the hidden picture
5 debugging the GUE
5 escaping the GUE
19 finding sundry items

Rank: The Ultimate Infocom Text Adventurer