In general, it is advisable to examine the portals and doors everywhere and read the letters if there are any on them.
First steps:
x gate
read letters
Entering the building:
ne
insert kunai in lock
w
w
OR
climb wall
open trap door
tie grappling hook to trap door
enter trap door
Exploration:
e
x shelves
x canister
get canister
shake canister
open canister
smell liquid
taste liquid
w
x counter
get leaflets
read leaflets
x bust
x plaque
w
(here you can enter the westfront, but this is optional; afterwards, return to the entrance hall)
n
e
x computers
turn on computers
x computers
play computers
x frames
(examine as many as you wish; syntax is "first 1993 frame", "second 1993 frame" and so on)
e
x frames
(again, examine as many as you wish)
w
w
x west portal
w
x walls
x blob
scratch blob off
push button
x bucket
get bucket
open bucket
x paint
x brush
get brush
pour liquid in paint
paint walls
z
e
n
x glass box
open box
unlock box with kunai
break box
break box with kunai
x tree
climb tree
x painting
n
x dragon
x pdp-1
talk to dragon
yes
play spacewar
play spacewar
Ending:
open box
get idol
s
s
s
e
(if you've come in through the trap door, unlock door with kunai)
e
yes
sw
s
OR
open box
get idol
x pedestal
stand on pedestal