Chester's Solutions for Arcade & Nightmare Modes

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In “That’s Not My Neighbor,” you’ll get the chance to meet several strange characters whose appearances come through your security window. Your goal is to figure out which ones might secretly be doppelgangers. One character you’ll come to know is Chester, a man who flips the script and starts asking you questions instead of the other way around.

Since this encounter is a bit different from what you’re used to, there’s a hidden achievement or trophy if you answer all his questions correctly. But be warned — Chester’s visits are unpredictable, and you won’t know exactly when he’ll appear. So it’s important to stay alert at all times.

When Does Chester Appear?

Chester is a random event that can happen anytime during your game. You’re guaranteed to meet him on your first run-through of each game mode, but predicting his exact arrival is tough.

He’s usually easy to recognize, though his look varies depending on the game mode. In Arcade Mode, Chester wears a red plaid button-up shirt with a white T-shirt featuring a peace sign. His red headband, silver hair, and intense stare are good clues. In Nightmare Mode, Chester looks more like a zombie, with pale skin, sharp teeth, blood splatters on his jacket, glowing pupils, and shadowed eyes, creating a scarier appearance.

How to Answer Chester’s Quiz (Arcade Mode)

When Chester appears by your window, he won’t give you any documents or try to enter the building. Instead, he’ll ask six trivia questions, repeating the same set every time he shows up. The questions differ between Arcade and Nightmare modes, with Nightmare questions being harder.

Note: Both versions of the game feature questions that aren’t multiple choice, and clues are scattered throughout your interactions. Playing multiple times helps you learn the answers by recognizing patterns and hints.

Important: If you get even one question wrong — either by answering incorrectly or misspelling the correct response — Chester will leave immediately. You won’t get another chance to answer until he appears again, which is unpredictable. Correctly answering each question moves you on to the next until you complete all six.

Make sure to double-check your answers before submission, especially since typos may cause a correct answer to be marked wrong.

Chester’s Arcade Mode Questions and Answers:

“What is the meaning of life, the universe, and everything else?”
Answer: 42
“What is the scientific name of the Australian animal that drastically changes its appearance when removed from its habitat?”
Answer: Psychrolutes Marcidus

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“What is the name of the only sport that allows punching your opponent after capturing a piece?”
Answer: Chess Boxing
“How many times must you fold a 0.01mm sheet of paper to cover the distance from the Shire to Mordor?”
Answer: 38
“What is the key to hide EQEY QBXM MBIA MWXM XUES MCMS BQIX WUEW AHWY MV?”
Answer: Uranus
“According to F.S.M., global warming is caused when the number of what decreases since the 19th century?”
Answer: Pirates

(Note: Answers are based on the version of the game you’re playing. If you’re on the older version from itch.io, answers will match this table. If you’re on the Steam remake, questions and answers may differ.)

Updated Questions for the Steam Version:

When was “The Answer to Life, the Universe, and Everything” published?
Answer: 1979
How many permutations does the most relevant Mersenne prime have?
Answer: 302400
Decode: MVWKZIEXN + WFLTENX =
Answer: 428653855
How many elements are in the power set of the set of palindromic numbers less than 10,000?
Answer: 536870912
The probability of guessing the correct 9-digit number answer at random is 1 in?
Answer: 900,000,000

Nightmare Mode — The Harder Version

In Nightmare Mode, Chester asks a new set of six questions, which are more difficult. The questions follow a fixed order, so with practice, you can learn the answers.

Sample questions include:

“Last name of the man behind the true face of the mask most known to internet users.” (Answer: Fawkes)
“Which number wins in Roman numeral rules?” (Answer: MMMDCCCLXXXVIII)
“Name the hairiest WWII lieutenant.” (Answer: Wojtek)
“Temple where a big pandemic began.” (Answer: Zul’Gurub)
“Organ that can clone anything it touches.” (Answer: SCP-038 or SCP038)
“Number formed by digits of the set’s cardinality of certain elements.” (Answer: 45360)

Some questions reference pop culture like World of Warcraft or the SCP Foundation, which can help if you’re familiar with those topics.

Rewards for Answering Chester Correctly

Answer all six questions correctly in Arcade Mode to earn a special badge and the “The Best In Class” achievement. This badge appears next to your desk for the rest of your game, showing your achievement.

In Nightmare Mode, answering all questions correctly unlocks a rare badge and the “Prolific Mind” achievement. Besides these visual rewards, there are no gameplay changes. This achievement mainly serves as a badge of honor you can share with friends.

Good luck outsmarting Chester!