This walkthrough is designed as a step-by-step guide.
It's spoiler-free, with the exception of maybe a name here and there.
Since I was a bit lazy sometimes, the style of writing is not entirely consistent.

And the formatting sucks. I know. :P

If any section is unclear, leave a comment and I'll update that section of the guide.

Also, LOTS of CAPS

• USE Mailbox
• TALK to Man
• LEAVE via western exit (Arrival at The Golden Stork)
• USE ID on Pige
• USE Dumpster
• GO back into Alleyway
• USE ID on DOOR
• USE Door
• PICK UP Coin
• GO BACK to Alum's house
• LEAVE via southern exit (stairs)
• USE DOOR to Aparment 121
• LEAVE via western exit
• USE Boulder at Statue's feet
• LEAVE via eastern exit
• TALK to Arc
• USE METAL PIPE on CONTRAPTION
• GO BACK to Apartment 121
• USE BOULDER on PIPE 2
• LEAVE via WESTERN EXIT
• USE STATUE
• GO BACK to Apartment 121
• USE PACKAGE on DOOR to Apartment 121
• GO BACK to ARC
• USE COINS on ARC
• LEAVE via EASTERN EXIT (Arcade)
• USE NOTE FROM ALLEY on GIRL
• USE ID (on the counter in the Arcade)
• TALK to VENDOR
• USE CORD
• TALK to VENDOR again
• USE CORD again
• USE CUP OF COINS
• USE COIN on COLEMIN'S LAST STAND
• PLAY the game
• Avoid bombs
• In the middle row, you can stand between the two yellow circles that are close by
• Get package to the left of the middle row
• Get to ending on top right
• USE TICKETS on VENDOR
• LEAVE the Arcade
• GO BACK to Alum's house
• USE BALLOON on STEAM PIPES
• USE second BALLOON on STEAM PIPES
• USE JOE's ID on JOE
• GO BACK to PLAZA IN FRONT OF ARCADE
• USE KEY on GRATE
• USE BALLOON on LEVER
• USE other BALLOON ON LEVER
• LEAVE through SEWER ENTRANCE
• (scene)
• LEAVE via WESTERN EXIT
• USE PLANT (bottom side of the screen)
• LEAVE via STAIRS
• LEAVE via STAIRS (east)
• LEAVE via eastern exit
• USE ROPE
• USE ROPE on STORK
• GO RIGHT to EXIT

• USE RUSHLIGHT on ALUM
• USE FIELD BOOK
• USE TRUNK
• USE BLUE PLANT
• USE ROCKS
• LEAVE via BOAT
• USE DAYLILY
• GO RIGHT
• USE EASTERN EXIT
• GO BACK into HOUSE
• TALK to SYMMETRY
• LEAVE via BOAT
• GO RIGHT
• USE EASTERN EXIT
• USE FLUTE on GUNTHER
• USE EASTERN EXIT
• USE BLUE LEAVES with EMPTY JAR
• USE JAR OF LEAVES on FLIES
• GO to SANDY GROUND
• USE STONES on HORN
• THROW when GUIDELINE aligns with your TARGET
• REPEAT
• USE HORN
• USE BOAT
• USE RUSHLIGHT on LURID
• USE BOAT
• LEAVE via WESTERN EXIT (Tree opening)
• USE DAYLILY
• USE JAR OF FLIES on GLYDE
• USE ROCKS on BIRD
• REPEAT until BIRD sits on the POST next to the DOOR
• USE EASTERN EXIT
• USE ROCKS on GUNTHER
• USE EASTERN EXIT
• TALK to GUNTHER
• GO LEFT
• USE DAYLILY
• TALK to GLYDE
• GO back to HOUSE
• LEAVE HOUSE via BOAT
• USE EASTERN EXIT
• TALK to GUNTHER
• REPEAT until he gives in (talk two or three times)
• GO LEFT
• USE DAYLILY
• TALK to GLYDE
• GO back to HOUSE
• USE WATER, BLUE LEAVES, DAYLILIES, FALLOW SALIVA and RED FEATHERS on E-POT
• USE LEVER
• LEAVE via EASTERN EXIT
• USE LIFE POTION on LILYPAD

• USE HATCH
• USE RUSHLIGHT on... (It's possible that these are randomized. If they are, you'll figure out your order)
• LOWER RIGHT MOUNTAIN
• LOWER LEFT MOUNTAIN
• UPPER MIDDLE MOUNTAIN
• DOOR
• UPPER RIGHT MOUNTAIN
• EXIT via DOOR
• (scene)
• USE TOOLS
• USE NOTEBOOK
• TALK to TITUS
• EXIT via NORTHERN EXIT
• EXIT via NORTHERN DOOR
• TALK to EITHER OF THE KIDS
• EXIT VIA NORTHERN EXIT
• USE ROPE
• USE LADDER
• USE RIGHT DOOR on GROUND FLOOR (next to the ladder you just used)
• TALK to AIRO
• USE SCREWDRIVER on VENT
• USE MAGNET
• USE CRATE
• USE SCREWDRIVER ON VENT
• EXIT via SOUTHERN EXIT
• USE LEFT DOOR on GROUND FLOOR (next to the ladder)
• USE ANTENNA
• USE CRATE
• USE PILLAR
• EXIT via SOUTHERN EXIT
• USE HATCH
• USE EXIT on STAIRS
• USE ROPE on MAGNET
• USE ROPE WITH MAGNET on GOBO
• GO BACK into the BASE
• TALK to KIAH
• LEAVE via EASTERN EXIT
• LEAVE via NORTHERN DOOR
• TALK to SOPHIE, IGLOO, ULGA, ELZY
• LEAVE via SOUTHERN EXIT
• LEAVE via EASTERN EXIT (Opening in cave, leads to TITUS)
• TALK to TITUS
• USE ANTENNA on TITUS
• USE GOBO on TITUS
• LEAVE via NORTHERN EXIT
• USE RIGHT DOOR on GROUND FLOOR (next to the ladder)
• USE DOGTAGS, PHOTO, FLOWERS, CUP, LETTER, NECKLACE on AIRO
• LEAVE via SOUTHERN EXIT
• LEAVE via EASTERN EXIT (Opening in cave, leads to TITUS)
• USE FUEL ROD on TITUS
• USE MOLE
• DRIVE to THE VIVIT OAK
• USE JAR
• USE JAR on HOT SPRING
• USE MOLE
• DRIVE to PRISON
• USE JAR OF WATER on HATCH
• LOOK at HATCH
• USE MOLE
• DRIVE to ROGATIONS BASE
• LEAVE via NORTHERN EXIT
• USE LEFT DOOR on GROUND FLOOR (next to the ladder)
• USE COMPUTER
• LEAVE via WESTERN EXIT
• LEAVE via EASTERN EXIT (Opening in cave, leads to TITUS)
• USE MOLE
• DRIVE to PRISON
• USE PIN CODE on HATCH
• USE HATCH
• USE LADDER in the MIDDLE
• USE SCREWDRIVER on GRATE (when nobody is standing on it)
• USE LADDER on the RIGHT
• USE ROPE WITH MAGNET on WALL
• USE RUG on E-BOT
• JUMP to the LEFT when nobody is looking
• USE RIFLE
• USE RIFLE on ELECTRIC BOX to the LEFT
• USE RIFLE on ELECTRIC BOX on the TOP
• REPEAT 2 TIMES
• USE DOOR

• USE RUSHLIGHT on BLAST PAD
• USE RUSHLIGHT on PIGE (you're welcome)
• LEAVE via EASTERN EXIT
• (scene)
• LEAVE via NORTHERN EXIT (Back alley)
• USE ID on DOOR
• USE DOOR
• (scene)
• USE PIPES
• LEAVE via WESTERN EXIT
• USE DEAD EBOT
• TRY LEAVING via EASTERN EXIT
• LEAVE via EASTERN EXIT
• (scene)
• USE WATER
• USE PIPE
• USE PIPE on PIPE
• USE VALVE
• USE KEY on GATE
• TALK to JOE
• USE RUSHLIGHT on JOE
• LOOK AT SIGN (L L R U L)
• USE DOOR
• LEAVE via WATER
• GO LEFT, LEFT, RIGHT, UP, LEFT
• (scene)
• USE GATE
• USE SWITCH
• USE GONDOLA
• ENTER HOUSE past the POST in the CENTER
• TALK to EVERYONE INSIDE
• USE PIGMENT
• LEAVE via DOOR
• ENTER HOUSE on the LEFT
• ENTER HOUSE on the RIGHT (Mr. Ammo's Cheese Shop)
• TAKE JAR
• LEAVE via DOOR
• TALK to KID
• Enter LEFT HOUSE
• TALK to GIRL
• LEAVE via SOUTHERN EXIT
• USE DOOR
• LEAVE via WATER
• GO RIGHT several times until you see a small boat
• USE TOY BOAT
• GO any directions to return to sewer entrance
• USE GATE
• USE GONDOLA
• ENTER HOUSE on the LEFT
• USE TOY BOAT on KID
• ENTER HOUSE on the LEFT
• LEAVE via SOUTHERN EXIT
• USE MOLE
• DRIVE to THE VIVIT OAK
• USE JAR on VIVIT WATER
• USE FISHING ROD on GUNTHER
• CLICK LIGHT
• CLICK SATELLITE
• CLICK CHAIR
• CLICK MUG (bottom half of the screen, on some sofa)
• CLICK MUG again
• CLICK KEY
• CLICK RUG
• CLICK DOOR
• CLICK POSTER
• CLICK FORK OF BABEL
• USE MOLE
• DRIVE to SLIP TOWN
• USE GONDOLA
• ENTER HOUSE past the POST
• USE JAR OF VIVIT WATER on LOOMIS
• USE RED PIGMENT on CANDLE
• LOOK AT CANDLE (you're welcome)
• LEAVE via DOOR
• LEAVE via SOUTHERN EXIT
• USE PIPE on CHAGRIN
• USE MOLE
• DRIVE to ROGATIONS BASE
• USE HATCH
• USE MOLE
• DRIVE to SLIP TOWN
• USE DOOR
• LEAVE via WATER
• USE PURPLE PIGMENT on CHAGRIN when they're not looking
• FOLLOW PURPLE WATER
• USE DANCE MOVES on CHAGRIN
• GO along PATH
• USE GOBO on CHAGRIN who's watching the fire
• USE RED PIGMENT on FIRE
• (scene)
• ENTER HOUSE on the LEFT
• LEAVE via SOUTHERN EXIT
• USE DOOR
• USE CHEESE on RUFUS
• USE FISHING ROD on GRATE
• CLICK CHAIR
• EXIT
• USE FISHING ROD ON LEFT VENT
• CLICK CHAIR
• EXIT
• USE FISHING ROD ON MIDDLE VENT
• CLICK CHAIR
• EXIT
• USE FISHING ROD ON RIGHT VENT
• CLICK CHAIR
• CLICK KEY
• USE KEY on GRATE
• USE RUSHLIGHT on ESTHER
• USE CHAIR
• USE THIRD POD FROM THE LEFT
• LAUNCHING THE ESCAPE POD:
• LOOK at MANUAL or FOLLOW THESE INSTRUCTIONS (don't worry, there seems to be no time limit)

• Explanation: U and L refer to the positions of the small switches in the lower right - i.e U U U L L L means the first three switches are in UPPER POSITION and the last three are in LOWER POSITION - always from LEFT TO RIGHT
  
• "Small Button" refers to the small button next to the six switches
  
• "Big switch" is the switch on the upper right
  
• "Pumping" is done via the hose-like thing on the lower left
  
• "Gauge" is on the top left
  
• 1. Pump to half gauge + big switch
  
• 2. Gauge empty + L L L U L U + Small Button
  
• 3. U L L L L U + Small Button
  
• 4. U U L L U U + Small Button
  
• 5. U L L U L U + Big Switch
  
• 6. Pump to Full Gauge + L L L L L L + Big Switch

• USE DROP POD
• USE ALL THREE LATCHES
• USE RUSHLIGHT on ALUM

• LEAVE via DOOR
• TALK to JACOB
• USE RUSHLIGHT on JACOB
• LEAVE via SOUTHERN EXIT
• DRIVE to COLEMIN'S GARRISON
• USE JACOB'S SECURITY CARD on PANEL
• CLICK DOWN ARROW
• USE DOOR WAY
• CLICK LEFT ARROW
• USE SKELETON
• USE DOOR WAY
• CLICK RIGHT ARROW
• USE JACOB'S SECURITY CARD on PANEL
• CLICK LEFT ARROW
• USE POWER CELL on DECODER
• USE DECODER on ENTRANCE
• BE QUICK: USE DOOR WAY when the TURRET is FACING THE OTHER WAY
• BE QUICK: USE BONES on SECURITY BOT as they appear
• CLICK RIGHT ARROW
• USE JACOB'S SECURITY CARD on PANEL
• CLICK LEFT ARROW
• LEAVE via ENTRANCE
• BEAT the minigame by avoiding bombs, fetching the CRATE on the left and getting to the upper right area afterwards to fetch the SUPPLIES
• (scene)
• USE C4
• SHOOT E-BOTS as they appear
• Tip: Dashu does not go from bottom floor to top floor in the right order. Example: When he goes through the first opening after you shot the first E-Bot, he re-appears on the fourth floor.
• Tip: When he handles the C4 on the second floor, shoot the balcony right under the yellow heat spiral or else E-Bots will keep respawning.
• Tip: When he handles the last piece of C4 on the top, an E-Bot will spawn one floor below, to the left.
• You'll figure out the rest, it's not difficult as long as you focus on the task at hand.
• USE C4 on FINAL C4 TARGET
• CLICK NO
• CLICK POTION several times

• USE URN
• LEAVE via SOUTHERN EXIT (Map)
• GO to ICE FOREST
• USE RUSHLIGHT on BOOK several times until the item appears
• USE UNFEIGNED SWORD
• LEAVE via EASTERN EXIT
• GO to ABANDONED MINE
• USE MINE CART
• USE KEEP OUT
• USE KEEP OUT again
• USE SIGN on MINE CART
• USE SIGN again
• USE URN on MINE CART
• LEAVE via WESTERN EXIT
• GO to GREAT PASS
• GO into CAVE (right side of the screen, barely visible)
• TALK to TENGLER
• USE RUSHLIGHT on TENGLER several times, follow her and keep using the RUSHLIGHT
• (scene)
• USE UNFEIGNED SWORD on DUNAMIS
• LEAVE via SOUTHERN EXIT
• GO to GREAT PASS
• GO into CAVE
• USE SKELETON
• LOOK at CARVINGS
• LEAVE via NORTHERN EXIT
• LOOK at KOSMOS
• USE RUSHLIGHT on OG
• USE BONES on WINGED CONTRAPTION
• (scene)
• The ABANDONED MINE will now be open
• GO BACK to GREAT PASS
• USE WINGED CONTRAPTION
• LEAVE via SOUTHERN EXIT
• GO to ICE PLAINS
• WALK AROUND the OBJECT in the middle of the screen THREE TIMES, CLOCKWISE
• USE BAG-O-ITEMS
• GO NORTH
• I will not list all item combinations, but they're easy enough to figure out (e.g. book on book shelf, oar on boat, log on fireplace, water on plant etc.)
• Tip: The first letter of the word in *asterisks* of Names's answer is the direction you need to go
• USE UNFEIGNED HELMET
• LEAVE via SOUTHERN EXIT
• GO to ABANDONED MINE
• GO into MINE
• USE RUSHLIGHT on POLE
• LEAVE via LADDER (that just appeared)
• USE POT
• USE WINGED CONTRAPTION on GWEN
• GO back to MAP
• GO to GREAT PASS
• GO into CAVE
• GO into OPENING in the MIDDLE on the LEFT SIDE
• OG will walk past the HOLE, use WINGED CONTRAPTION on POUCH when in range
• USE COINS
• USE STITCH
• GO BACK to MAP
• GO to ABANDONED MINE
• GO into MINE
• LEAVE via LADDER
• USE BONES on TARGET
• While GWEN is DISTRACTED, USE POT
• USE POTION on SOUP
• LEAVE the MINE
• GO to GREAT PASS
• GO into CAVE
• LEAVE via NORTHERN EXIT
• USE POISONED SOUP on OG
• LEAVE via EASTERN EXIT
• USE WINGED CONTRAPTION on POUCH again
• USE MAGIC PHRASE on HAROLD
• GO to MAP
• GO to MOUNT HESED
• USE UNFEIGNED ITEMS on DUNAMIS

• ATTACK when Og moved to the middle of the screen
• USE TITUS on TITUS two times
• USE JACOB on CAN
• USE CAN on DASHU
• USE CAN on GREEN BUTTON
• USE ELZY on CAN
• USE CAN on JACOB
• USE JACOB on CAN
• USE CAN on BUTTON on the LEFT WALL
• USE ELZY on CAN
• USE CAN on DASHU
• USE CAN on BUTTON below GREEN BUTTON
• (scene)
• LOOK at RUSHLIGHT
• USE UNFEIGNED SWORD on WIRE
• (scene)
• SWITCH to DASHU
• USE RIFLE on CAMERA
• USE CAMERA
• WALK on one of the FLOOR PLATES to make it LIGHT UP
• SWITCH to ALUM
• WALK on the other FLOOR PLATE to make it LIGHT UP
• LEAVE with BOTH CHARACTERS via NORTHERN EXIT
• SWITCH to ALUM
• USE UNFEIGNED SHIELD on TURRET
• SWITCH to DASHU
• GO through DOOR on the LEFT
• USE PANEL
• USE PANEL again
• CONNECT RED WIRE to something else
• USE RIFLE on CAMERA
• USE E-BOT TOP
• USE both LENSES on E-BOT TOP
• LEAVE ROOM with DASHU
• LEAVE via NORTHERN EXIT
• USE E-BOT TOP on TV
• LEAVE via NORTHERN EXIT
• USE DOOR on the LEFT
• USE PANEL
• CONNECT GREEN WIRE to POD
• SWITCH to ALUM
• LEAVE ROOM
• LEAVE via NORTHERN EXIT
• USE TV
• SWITCH to DASHU
• CONNECT GREEN WIRE to EBOT 2
• SWITCH to ALUM
• LOOK at MAP
• TAKE NOTE of WRITINGS: Flip BIG SWITCH 6 times, Press SMALL BUTTON next to the 6 switches
• USE TV
• SWITCH to DASHU
• USE COMPUTER
• (location change)
• GO RIGHT
• USE DROP POD
• FLIP BIG SWITCH in UPPER RIGHT CORNER -6- TIMES
• PRESS SMALL BUTTON in the BOTTOM CENTER
• USE HIDDEN NOTE
• SWITCH to ALUM
• SWITCH to DASHU (intentional)
• USE PANEL
• CONNECT GREEN WIRE to EBOT 3
• SWITCH to ALUM
• USE TV
• SWITCH to DASHU
• USE COMPUTER
• (location change)
• WALK to the RIGHT SIDE of the CHAIR
• USE CHAIR
• SWITCH to ALUM
• GO through DOOR on the RIGHT
• GO through MORE DOORS
• The wires show you which way you need to go. But here's the solution:
• BLUE
• RIGHT
• RIGHT
• UP
• RIGHT
• DOWN
• DOWN
• RIGHT
• UP
• RIGHT
• RIGHT
• RIGHT
• DOWN
• DOWN
• DOWN
• RIGHT
• RIGHT
• USE LASER DEVICE
• USE PASSCODE (Piece of paper) on SECURITY MAINFRAME
• LEAVE ROOM
• GO THROUGH MORE DOORS to REUNITE with DASHU
• LEAVE via NORTHERN EXIT with BOTH CHARACTERS
• WALK with ALUM onto a FLOOR PLATE
• SWITCH to DASHU
• WALK with DASHU onto a FLOOR PLATE
• Automatic switch to Alum
• WALK to the RIGHT
• WALK to the RIGHT some more
• LEAVE via DOOR
• FINAL BATTLE

• How to win the battle:
  
• When attacking and blocking, your enemy will sometimes move closer to the window
  
• When closest to the window, click on Esther to have her kick the chair
  
• Your enemy will be distracted by the chair. As soon as you can, click block to win the battle

• USE RUSHLIGHT on ESTHER
- THE END -