Color-coded list of the direct consequences of each choice. See walkthrough here.

(~) = no immediate effect
(*) = branching point

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Weird, echoing voice
Follow the strange voice (cool +1)
Turn and run (~)

Pit stop
Pause the movie (cool +1)
Ignore Maria (cool -1)
Ask Maria to wait (cool -1)

Being watched
Play it cool. You’re almost eleven! (cool +1)
Search for the eyes (~)

Hammy out of cage
Check this out (cool +1)
Grab him! (cool -1)
Keep on sleeping (cool +1)

Move the wheel
Try to spin it with your mind (power -1, cool +1)
Not now (power -1)

Grandma
Yes, tell her. (cool +1)
Keep it a secret. (~)

Blow candles
Blow them out with your mind (power -1, cool +1)
Blow them out with your breath (~)

Grandpa
Hug him (cool -1)
Don’t hug him (cool +1)

Versus Gramps
Go for your weapons (~)
Talk to Gramps (life -1)

Get to the weapons
Use telekinesis (power -1, cool +1)
Run through Gramps (life -1)

Weapons
Use the Zapper (life -1, eventually cool +1)
Use the Yo-yo (cool +1)
Talk to Gramps (life -1, cool -1) (*)

Weapons II
Use the Zapper (life -1, eventually cool +1)
Use the Yo-yo (cool +1)

Maria at the door
Politely ask Maria to leave (cool -1)
Let Maria stay (cool +1)

Impatient Maria
Tell her to please cut you some slack (cool +1)
Don’t say anything (~)

Move neighbours
Let Maria use her powers (cool +1)
Use your powers to move them (power -1, cool -1)
Tell her to wait (cool +2)

Backdoor
Walk right in (life -1, cool -1)
Check it out a little more (cool +2)
Forget this, you are going home (cool -1) (*)

Backdoor II
Walk right in (life -1, cool -1)
Check it out a little more  (cool +2)

Bob Brown
Pretend to call the police (cool +1)
Have Maria use her powers (~)

Ghost cats
Use the zapper (cool +1) (*)
Use the yo-yo (eventually life -1)

Ghost cats II
Switch to using your yo-yo (cool +1)
Keep using the zapper (life -1)

Healing powers
Have Maria heal you (life +2)
Tell her to heal herself (cool +1)

Hit his face
Charge and swing! (life -1, then life -1 again)
Use your telekinesis (cool +1, power -1)
Try to remember the cat’s name (*)

Cat’s name
Whiskers (~) (*)
Tiger (cool +2)
Sir-Meows-Alot (~) (*)

Hit his face II
Charge and swing! (life -1, then life -1 again)
Use your telekinesis (cool +1, power -1)

Change course
Use telekinesis (power -1, life -1)
Ask Maria (power -1, cool +1)

Saber tooth tiger
Zap the tiger (cool +2)
Ask Maria what to do (life -2)

Bob: What are we laughing about?
‘Nothing.’ (~)
‘We’re laughing at you.’ (cool -1)
‘At a knock-knock joke.’ (cool +1)

 

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Achievements
Completed Ghost Hunter: JJ Jones
Highest rank for Ghost Hunter: JJ Jones