REC · CASE #001 · INTERROGATION ROOM 3

A body in the water. A man who says he was asleep. Four explanations still fit the evidence, and he is the only one who knows which. The truth is in the room with you.

The Art of Interrogation

  • PC & Mobile
  • 5–10 min cases
  • Planned Q2 2027

File 01 · The premise

Interrogate the suspect. Build the case.

Murder Book: The Art of Interrogation is an interrogation-driven investigative puzzle game.

Question the suspect, test their story against the evidence, and connect what you uncover. Their answers can reveal claims, admissions, confessions and contradictions — and open new ways to investigate the case.

Several explanations can fit the same facts. Follow the one the evidence supports, change direction when something else becomes more convincing, and at the end choose the Theory you believe you have built the strongest case for.

The court weighs what you found, what is still missing, and whether another explanation leaves reasonable doubt.

Exhibit A: the interrogation room

For fans of Her Story · Papers, Please · L.A. Noire · Return of the Obra Dinn

Genre
Interrogation mystery
Session
5–10 minute cases
Platforms
PC & Mobile
Studio
Gungrounds, Zagreb, Croatia

File 02 · Interview log · recording

Four steps between a statement and a verdict.

  1. Case select screen showing 'Case of the Hidden Gun' with results, completion bar at 58% and locked case slots
    01

    The file

    Start with what the investigation already knows.

    Review the evidence, witness testimony and other case information before you begin questioning. During the interrogation, new information can also open further research and uncover new proof.

  2. In-game casebook listing the suspect behaviours a player can recognise during an interrogation
    02

    The question

    Choose exactly what the detective says.

    Ask for details. Build trust. Present evidence. Point out a contradiction. Apply pressure.

    You see the words. The effect behind them is hidden. What you choose can change the suspect's response, what they reveal and where the interrogation goes next.

  3. Evidence board linking suspect statements such as 'I NEVER met her!' and 'I had no idea' with red string to a fabricated description of the gun
    03

    The connection

    Work out what the answers mean.

    Between questions, connect information you have already uncovered and form a conclusion. What happened? What is possible? What does not fit? What follows from what you already know?

    Make the right connection and you may uncover another path through the interrogation.

  4. In-game menu of interrogation approaches the detective can take with a suspect
    04

    The commitment

    Build the Theory you can support.

    Several explanations can remain possible at the same time. Follow the evidence, pursue the Theory that becomes more convincing, and change direction if the case changes.

    At the end of the interrogation, choose the Theory you believe you have built the strongest case for. The court weighs the proof behind it, what is still missing and whether another Theory creates reasonable doubt.

    • Reduce Pressure
    • Strategic Silence
    • Commit to Detail
    • Baiting
    • Demonstrate
    • Confront with Evidence

    How you question the suspect matters. Lie about evidence, make promises you cannot keep or use coercive tactics, and the proof you obtain may be challenged or excluded in court.

    You can win the room and weaken the case.

File 03 · Field notes on behaviour

Thirteen behaviours. None of them is proof.

During questioning, pay attention to how the suspect answers. Recognising a behaviour can open new branches and choices. It is never treated as proof that the suspect is lying or guilty.

Hover or tap a behaviour to read what it looks like in the room.

Observation ≠ proof

File 04 · Every case branches

Several theories. Build the one you can prove.

More than one explanation can fit the evidence.

As you question the suspect and uncover Court Proofs, different Theories take shape. Follow one far enough and new information, questions and paths open.

But you are never locked in. If another Theory becomes more convincing, change direction and follow the evidence.

At the end, choose the Theory you have built the strongest case for. The court weighs the proof behind it, what is still missing, and whether another Theory leaves reasonable doubt.

  • Follow a Theory deeper — more information, Side Paths and Court Proofs.
  • Change direction — another Theory can become stronger as you learn more.
  • Challenge the proof — Court Proofs can remain clean, be challenged, or be excluded.
  • Reach different endings — one playthrough will not reveal everything.
Branching case map for Case #001 showing an introduction splitting into many branches, with achievement endings and 60% completion
Case #001: branch map

File 05 · Built for short sessions

A full case on your commute.

Cases run 5–10 minutes, designed for quick play on PC and mobile.

One playthrough will not reveal everything. Follow different Theories, uncover different information and open different paths through the interrogation.

And an interrogation can end before you are ready. Increase the pressure too far and the suspect may ask for a lawyer, leaving you to build your case from what you uncovered.

5–10
minutes per case
PC + Mobile
target platforms
Multiple paths
one playthrough will not reveal everything
Murder Book title screen with New Game, Settings and Credits over a red-lit interrogation table
Portrait mobile layout of the evidence board with behaviour icons and an interrogation technique button

File 06 · After the verdict

The file does not close when the court does.

The verdict is not the end of the case. Murder Book evaluates the investigation you built.

How well you read the suspect. Which Court Proofs were challenged or excluded, and why. How the contradictions affected the suspect's credibility. Which competing Theories were still supported when you committed to yours. The questions left unanswered.

And how much of the available information you uncovered.

Your case
How strong it was, and what was missing.
Reasonable doubt
Yes or no, and the factors behind it.
Challenged / Excluded
Which Court Proofs were affected, and why.
Suspect credibility
What the contradictions did to their account.
Conduct
None, moderate or high.
Open questions
What remains unanswered.
Information uncovered
How much of the available Court Proof you discovered.

File 07 · The studio

Made by Gungrounds.

Gungrounds is an independent game studio founded in 2016 in Zagreb, Croatia. The team started out developing and porting games for Armor Games, Newgrounds and Kongregate, and has since shipped original titles and worked with some of the industry's best-known names.

Past clients & partners Devolver Digital · Croteam · Mad Head Games · Miniclip · Fumi Games

The case team

  • Kristian MacangaGame Design · Development · Programming
  • Andrej MrkonjicProgramming
  • Antonio VillamandosConcept Art
  • Sinisa BahunStorytelling · Game & Level Design
  • Matija VigatoStorytelling · Game & Level Design
  • Noemy De GuzmanMarketing

File 08 · Supported by

Co-funded by Creative Europe MEDIA and HAVC.

Murder Book: The Art of Interrogation is co-funded by the European Union through the Creative Europe MEDIA programme (2023), which supports the development of original European audiovisual and video game works.

The game is also co-funded by the Croatian Audiovisual Centre (Hrvatski audiovizualni centar, HAVC).

Developed in Zagreb Croatia · EU 45.8150° N, 15.9819° E

File 09 · Press & partners

Open the file.

Factsheet

Title
Murder Book: The Art of Interrogation
Developer
Gungrounds
Based in
Zagreb, Croatia
Genre
Narrative-driven interrogation
Platforms
PC, Mobile
Session length
5–10 minutes per case
Release
Planned for end of Q2 2027
Co-funded by
Creative Europe MEDIA (2023) · Croatian Audiovisual Centre

Press kit

Screenshots, logos and the full factsheet are on the Gungrounds press sheet.

Full press sheet on gungrounds.com ↗

File 10 · Questions

Frequently asked questions.

What is Murder Book: The Art of Interrogation?

Murder Book: The Art of Interrogation is an interrogation mystery by Gungrounds, an independent studio in Zagreb, Croatia. You question a suspect across a table and turn what they say into proof: claims, admissions and contradictions. Several explanations of the case stay alive at once, and at the end you commit to the one you believe you can prove. A court then decides whether you were right.

What games are similar to Murder Book?

Murder Book is for players who enjoy dialogue and deduction-driven detective games such as Her Story, Papers, Please, the interrogation scenes of L.A. Noire, Return of the Obra Dinn, Contradiction and Interrogation: You Will Be Deceived. What sets Murder Book apart is that the case has no confirmed answer: you build the explanation you can prove, and the verdict turns on reasonable doubt.

What is a good interrogation or lie detection game?

Murder Book: The Art of Interrogation is built entirely around interrogation. You choose exactly what the detective says, read thirteen documented behaviours such as omission, deflection and selective memory, work out what the answers mean, and build a case from proof that can be challenged or thrown out. How you get an answer matters as much as getting it.

Is Murder Book based on real interrogation techniques?

Yes. The behaviours, the questioning and the ethical limits come from real interview practice and research. The game is deliberate about one thing the research is clear on: a behaviour is a reason to ask again, never proof that someone is lying.

How long is a case in Murder Book?

Each case takes about 5 to 10 minutes. Cases branch into multiple endings, with achievements and completion tracking that reward replaying, and a single pass is not meant to reveal everything. An interrogation can also end early if you push a suspect into asking for a lawyer.

What platforms is Murder Book on and when does it release?

Murder Book is in development for PC (Steam) and mobile. Release is currently planned for the end of Q2 2027.

Who is developing Murder Book?

Murder Book is developed by Gungrounds, an independent game studio founded in 2016 in Zagreb, Croatia, led by Kristian Macanga. The studio previously made Serious Sam: Tormental. Murder Book is co-funded by the European Union's Creative Europe MEDIA programme and the Croatian Audiovisual Centre (HAVC).

Is Murder Book the game related to the Murder Book TV series, podcast or novel?

No. Murder Book: The Art of Interrogation is an original video game by Gungrounds. It is not connected to the TV series, podcast or books that share the name; "murder book" is a police term for a homicide case file.

File 11 · On the record

Murder Book in the news.

Articles, funding announcements and industry listings about Murder Book: The Art of Interrogation.

Enlarged screenshot