press and hold i to look in your inventory (while not having the mouse cursor on an interactable spot/item)
press and hold space bar to show interactable spots/items
press the left mouse button to interact
things in the game not mentioned here are optional, most of that is funny
most things to do in the same chapter can be done in any order
you can interrupt talk (by clicking) and proceed (handy with long talks)

when pressing the left mouse on an interactable spot or item:
(look) = magnifier
(hand) = action
(gear) = use object from your inventory
(text) = balloon, dialogue, talk
REC = dictaphone
when recording an item Hans has already recorded, Hans says I have already made an entry on this.

this guide is full of spoilers!

Gretchen arrives on a motor at a gasstation in space
(hand) Kick rain pipe, key falls out. (hands) Pickup key.
(hand) Open tool box. pliers go in you inventory.
(gear) use key on door
(hand) open door
(look) at picture connected with electrical cables
(hand) on same picture reveals hidden switch
(hand) on hidden switch to turn on electricity
(gear) use plier on electrical cables
(hand) postcard (to pick up a postcard with a map of the area)
(hand) pick up cup on a table
(hand) door (go outside)
(gear) use cup on freezer (to get cold water as coolant)
(gear) use cup on motor bike (to cool the motor)
(hand) petrol pump (to get petrol in the tank of the motor)
(hand) motor (to start the motor)

automatic REC dictaphone when get out of the bus (recording #1)
automatic REC dictaphone when arrive on the village square (recording #2)
(hand) Klaus (fox "that is one strange looking cat")
(gear) use REC dictaphone on sign Mobius Palast (recording #3)
(hand) door of pension
automatic hand on bell
Gretchen sits in a chair, optional (text) talk with Gretchen
(hand) bell
(text) talk with Trude
automatic REC dictaphone after the thief left (recording #4)
(look) at goo
go downstairs
(look) at goo
go outside
automatic REC dictaphone out of pension (recording #5)
(look) at goo
walk (follow trail of goo) click in front of Hans
automatic talk with Gretchen
automatic walk up
automatic REC dictaphone on the gondola (recording #6)
(look) at goo
(text) talk with Gretchen, use all possible answers, hear her story
(achievement) The Lazarus Incident: Finish the Prologue

(gear) use REC dictaphone on mountains, rope of the gondola, Gretchen, electrical cable, yellow phone booth, hexagon (recording #7 #8 #9 #10 #11 #12) in any order
(hand) take cardboard box
go back to the pension
(gear) use REC dictaphone on sign pension (recording #13)
(hand) door, go into the pension
(text) talk with Trude, hear her story and mention her daughter and her brother

• usually, report the theft to Trude
  
• don't report the theft for the achievement A Matter Of Perspective at the end of chapter 1

when Trude asks 'Anything else I can do for you?' answer with 'I feel ready for a beer'.
(hand) drink the beer --> (hand) pick up the two coasters (one on the floor, one on the table)
(look) at the paper
(gear) try to open the door next to the television to find out it is locked
(text) talk with Trude: I noticed something... about the locked door
(gear) pick up the can on the floor in front of the table with the food
(look) (gear) (hand) use REC dictaphone on the food on the table (2 times, recording #14 #15) to get the cheese skewer and the maggot
(hand) on the television
automatic talk with Leni
(gear) use REC dictaphone on Leni (recording #16)
(hand) on the stair --> you are in your room
(hand) pick up the towel
(hand) on the carpet on the floor
(hand) on the hidden stash
(look) at the massage rod under the bed
(gear) REC dictaphone on the mouse hole in the wall under the window (recording #17)
achievements for the recordings / dictaphones
(hand) on the closet to open it
(hand) on the hanger in the closet
(hand) on the window to open it
(hand) on the hanger outside the window
(hand) on the window to close it
(hand) on the door opening of your room --> you are downstairs
(gear) on Trude, use the massage rod as deposit (pawn) for the fishing rod
answer Yes to get the fishing rod
(hand) on the door, go outside
(gear) use the coasters on the table in front of the baron (old man in wheelchair)
(text) talk with the baron, use all possible answers and certainly mention Klaus
go to the lake

• when you see Klaus on the roof of Hades pedal boat rental, you haven't mentioned Klaus to the baron
  
• as long as you have not talked about Klaus with the baron, you can not progress beyond this chapter
  
• if Klaus is in the tree then proceed

(gear) use towel on the pedal boat
(hand) on the reed
(gear) use reed + skewer + beer on Klaus, Klaus falls down on the towel and then on the ground
(hand) on Klaus
(gear) use the fishing rod on the landing stage to catch a can opener
go to the village square
(gear) use can on Klaus
(gear) use cardboard box on Klaus
go up
(hand) on Klaus to drive Klaus to the power station
(hand) on Klaus to catch Klaus
(hand) on the stairs to go down to the village square
(gear) use Klaus on the baron to give Klaus to the baron
(achievement) Ode to Klaus: Save Klaus
(text) talk with the baron about the old cable car, use all possible answers, ask What's about the cable car and receive the key for the old cable car
(gear) use the can opener on the armor
(gear) use REC dictaphone on the armor (recording #18)
(hand) on the armor
go up
(hand) on the broken electrical cable, after repair you end up on the village square
go up
(gear) use key on engine
(gear) use hangers on rope
Hans and Gretchen get on the hangers
Hans falls
(achievement) Welcome to Trüberbrook: Finish Chapter One

walk, you end up in a bed in a cliniq
...after a short period of time...
(hand) on Hans several times, Hans regains conscience
conversation with a 'dokter', answers don't matter now
automatic REC dictaphone (recording #19)
(hand) on the skeleton to put the skeleton in the bed
(hand) on the shower curtain to open it
(hand) on the shower hose to find a coin that somehow ends up in your inventory

• you can take a shortcut to the test by (hand) on the door to knock
  and answer I'm ready to take the test

(look) at the stepladder (stair) stepladder appears in your inventory
(gear) use the stepladder on the airvent
(hand) on the airvent
(gear) use the coin on the airvent
(hand) on the stepladder to squeesh through the airvent
(hand) on the office door upstairs
(hand) on the barbecue to take the hat
leave that office and go downstairs
(hand) on the lamp
(hand) on the airvent to return to the room with the bed
(gear) use the hat on the fusebox
(look) on the writing on the wall in the douche
(gear) use the lamp on the writing on the wall in the douche
(look) at the the writing on the wall in the douche (code for the safe downstairs)
(hand) on the stepladder to go through the airvent again
(gear) use the code on the safe
'dokter' appears and tells to take the test now
(text) on 'dokter', answer in the test as follows:
-- associations --
war / mesh of dots and lines
cruelty / this is obsolete
a butterfly
-- self-assessment --
two
three
two
four
-- colors --
exciting
cozyness
fragile
-- shapes --
rectangle
triangle
-- questions where you have to choose an answer --
moon
hippie / suit
lion / hammertoe
Elvis / Amelia ... Earhart
onions / eagle
-- childhood --
Endless. Summer. Vacations.
could you be projecting your own insecurities to others?
Yes!
-- test ends --
...wait until Hans stands up
(hand) on the key on the left wall
(hand) on the door in the right wall
(gear) on the lock on the right door
(achievement) Paradiso: Finish Chapter Two

automatic REC dictaphone outside of the entrance of the mine (recording #20)
(hand) on the rusty old cogwheel at the side of steel frame where cable ends
(hand) on the chain that is part of the cable car
(gear) use chain on the door of the shed
(hand) on the engine, this opens the shed
(hand) on the propane container in the shed
(look) at the pile of stones (debris) between the old ore mining cart and the shed, helmet appears
(hand) on the helmet
(gear) use REC dictaphone on the tent (recording #21)
(hand) on the belt in front of the tent
(gear) use the cogwheel on the old ore mining cart
(gear) use the propane (flame) and the belt on the old ore mining cart
(hand) on the old ore mining cart to climb in the mining cart, Hans put on the helmet, then Hans shoots into the mine
at the end of the tunnel, the mining cart crashes in a cave
automatic REC dictaphone in the cave (recording #22)
(hand) on the pickaxe
(gear) use the pickaxe on the lowest over hanging rock
(hand) on the pickaxe
(gear) use the pickaxe on the cogwheel to take the cogwheel
(gear) use cogwheel on the vaLve (middle section) on the pipe to place the cogwheel
(hand) on the cogwheel to open the valve
(gaer) use the pickaxe on the pipe
(hand) 3 times on the part of the mining cart where you sat in to kick it into the water to turn it into a boat
(hand) on the mining cart to climb in and get to the other side
(hand) on the rails to climb up
(gear) use REC dictaphone on steel gate (recording #23)
light up these symbols (in this order, look at it to light it up):
(look) hexagon (right side of rope, middle of screen)
(look) hieroglyphs (top left corner of screen)
(look) latin inscriptions (a bit left of vault door)
(look) rune (top of screen, middle)
(look) graffito (top right corner of screen)
(hand) on the knob left from the steel gate
find the light switch
(hand) on the bottle at the most left on the screen in front of the hardware cabinet
(gear) use REC dictaphone on the model of the solar system (recording #24)
(gear) use bottle on the model of the solar system
(hand) on the memory board on the table under the model of the solar system
walk to the door to the right side of the model of the solar system
(hand) on the panel with the red blinking light to open it
(gear) use the memory board on the open panel to install the memory
automatic and manual talk to Barbarossa 2000, in between (hand) on the panel where the smoke comes from to open it
talk with Lazarus Taft while he is opening a door
(achievement) The Tannhauser Gate: Finish Chapter Three

Dull Trumps: Discuss the Doppelkopf Rules 10 Times with Lazarus
(hand) on the empty jar on the hyperlogic coupler
go downstairs
(gear) give the phishing rod back to Trude and get a whistle instead
(hand) take the "stew" on the table
go outside
go up to the gondola / phone booth
(gear) use REC dictaphone on the phone booth and the hexagon (recording #25 #26)
go to the tree in front of the lake
(hand) on the lottery ticket near the tree
(hand) kick the lamp post
(gear) use the empty jar on the fireflies
(gear) use the whistle on the tree to get the birds in the tree
(gear) use REC dictaphone on the birds (recording #27)
(gear) use the almond food on the birds
go to in front of the pension
(gear) use the whistle on the antenna
(gear) give the lottery ticket to the girl
(text) talk with the baron and ask if he was at the raffle (fair) and trade the cat food with a pair of hiking boots
go up to the cable car
(text) talk with woman until you get dialogue options
(text) ask about the raffle and exchange the pair of hiking boots for the snuff tobacco
go back to the village
(text) ask the sailor man about the raffle and trade the tobacco for a ticket for the boat trip
(hand) take floating device shaped like Pteranodon
Go left in the woods and take trash can lid from the ground
"Talk" to tree and whistle something.
Climb up and take apple from the tree.
Climb up and talk with Lessing about everything.
Take blades from the windmill and go to the booth of Hades boat rental
Talk with the woman in the booth about the pedal boat (it has a leak)
Use "stew" on the pedal boat and after that use blades of the windmill on the pedal boat
take postcard in front of the booth
(hand) use pedal boat
(gear) use REC dictaphone on the remains of the sea monster (recording #28)
check out the corpse
(hand) take boots and key from the corpse
(gear) use REC dictaphone on the corpse (recording #29)
Use green glowing spot and go back to woods where Lessing lives.
(text) talk with woman and she will give you vitamins. Go back to village and use vitamins on high striker.
go into the pension
(gear) use the key on the door to the cellar
go downstairs
(look) at the note
(hand) take trash can lid, malt, yeast
(look) at the burner and (look) at the boiler / kettle
go to Trude and (text) ask her something
(text) Got a light?
Trude gives a lighter
go to the lake
(hand) use the pedal boat
(gear) on the water and use the boots and the trash can lids
(gear) use REC dictaphone on the mushrooms (recording #30)
(hand) take the mushrooms
(gear) on the water and use the boots and the trash can lids
(gear) use the lighter on the burner and use items in this order on the distillery: 1. apple 2. malt. 3. yeast 4. mushrooms
go to the right and take alcohol
wake up at the bus stop
walk back to the village
...boom...light...
you meet Madonna
go back to the village
(gear) use the beer on the musician
attend the concert
choose multiple music
when the band stopped playing, take their accordion
go to the weather station (up in the mountains)
(gear) REC dictaphone on the office / loods (recording #31)
(text) talk to Madonna and also ask to repeat the message
(gear) use some jar on the shovel / spade to take the spade
go back to the swamp
go to the green glowing place
(gear) use spade on the green glowing
(gear) use the lead trophy on the rock from outer space
go back to the pension
(text) talk to Trude and say you would like to dispatch a telegram
use the numbers below from the telegraph message from weather station
07204
10433
22608
40018
18109
00030
04103
go back to the weather station
(text) talk to Madonna
say I've got an answer from the headquarters
go to and open with the screwdriver all 3 weather cabinets (stations)
go back to the weather station
(text) talk to Madonna
say I have got your measurements
fill the floating device with helium
go back to the pension
(gear) use the screwdriver on the tv
(gear) use the necessary components on the quantum discriminator
--- the quantum discriminator is now complete ---
---- in the science lab ----
(hand) on the leftmost panel to open the door
(hand) on the open door to walk through
(gear) use the quantum discriminator on the portal to move you around (click the yellowish Hans on the position you want to go)
(hand) on the panel
(gear) use the quantum discriminator on the portal to move you around (click the yellowish Hans on the position you want to go)
(hand) on the pieces, collect all pieces
when you see all village people in white statues, (hand) on the Gretchen statue to remove the shield around Gretchen
(gear) use the quantum discriminator on Gretchen multiple times until she stands in front of the portal
(hand) on the big panel to make Barbarossa force Gretchen into the portal
automatic REC dictaphone (last recording)
choose LEAVE or STAY BEHIND