In this little thing Jeff will write all his thoughts about some events or locations.
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There is only one thing that can prevent Jeff from that.

Exactly - if he is out of ink. His bottle is completely empty, so he need to find special bottles in the studio to fill his bottle.
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Your current amount of ink in the bottle will be shown on your screen.
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You can check your notes in the pause screen.
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Also for writing all the notes in each chapters, you will get trophies!

p.s: If video is super low quality, then sorry for that.