Why does coffee not solve the level?

It is an intentional weak remedy; continue to the spider and hidden menthol.

Where is the menthol?

Open the desk drawer after the spider scare.

Two other coworkers are sleeping while seated and must be removed in the final phase.

Brain Puzzle: Tricky Quest level guide

hard

Let coffee and the fan fail, then use the wall spider, drawer menthol, fresh air, and a final check of the seated coworkers to keep the office awake.

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Give the lower-left worker the coffee and tap him when he remains sleepy.
Switch off the tower fan so the cold air stops, then continue past the next “Still so sleepy” response.
Use the scissors near the web and place the wall spider on the sleepy man's head.
Open the desk drawer and apply the hidden menthol item to wake him again.
Open the left window or let fresh air blow into the office.
Remove the two coworkers who are also sleeping while seated to complete the level.

Board notes 5 details

Layout: Four workers surround a long desk with coffee, monitors, a tower fan, scissors, a wall spider and web, a drawer, and a left window.
Goal: Wake the lower-left man with the hidden strong stimuli and clear the two other employees sleeping while seated.
Opening: Give the sleepy man coffee, tap him, and switch off the cold fan to expose the false solutions.
Danger Zone: Repeating coffee never advances the puzzle; the wall spider and drawer menthol are the decisive items.
Mechanics: Weak wake-up attempts unlock a fear stimulus, menthol treatment, fresh air, and a final sleeper-removal phase.

Why does coffee not solve the level?
It is an intentional weak remedy; continue to the spider and hidden menthol.
Where is the menthol?
Open the desk drawer after the spider scare.
Why is the level not complete after the main worker wakes?
Two other coworkers are sleeping while seated and must be removed in the final phase.