FOREWORD: I strongly recommend you try using the comprehensive in game HINT system before resorting to this walkthrough as it will guide you gently to the solutions, rather than just telling you what to type.  If, still, you wish to use the walkthrough, here are the steps required to get the final ending.  To get the other 3 endings, simply type wait until your time runs out either before disarming the smoke alarm, before setting the fire alight, or before completing the final ending.

WALKTHROUGH:

look at alarm
take alarm
take photo
throw photo at alarm
e
s
search cobwebs
turn dial off
n
w
throw photo at alarm
w
take toaster
e
throw toaster at alarm
look at alarm
take battery

w
look at fridge
look at magnet
e
e
look at rubbish basket
take rubbish basket
w
drop rubbish basket
e
s
look at dryer
look at dust filter
open dryer
n
w
w
look at sink
take butter knife
e
e
s
open dryer with butter knife
look at lint
take lint
n
w
put lint in rubbish basket
s
look at tree
look at branch
take branch
inventory
remove nylon stockings
make lasso with nylon stockings
lasso branch
n
put branch in rubbish basket
put framed photo in rubbish basket
break framed photo
throw framed photo at fan
e
s
turn dial to high
n
w
throw framed photo at fan
take splintered frame
put splintered frame in rubbish basket
look at battery
w
look at Buddha
look at beard
touch battery to beard
e
e
s
turn dial to low
n
w
w
touch battery to beard
e
look at futon
look at pillow
take pillow
take gas bill
w
touch battery to beard
look at gas bill
e
put gas bill in rubbish basket

look in brassiere
take mobile phone
look at mobile phone
listen to messages
move futon to front door
listen to messages
break finger
close finger in sliding door
jump
e
s
turn dial to high
n
w
jump
look at shattered glass
take shard
take bent photo
look at bent photo
look at your eyes
scratch your eyes with shard
close sliding door
run s
w
look at gas oven
open gas oven
turn gas switch to high
e
run s