Quick answer: Cold Crime: Murder Mystery is a mobile detective game played on the victim's phone: you read their messages, call log, photos and notes, unlock hidden albums with codes found in the evidence, and answer case file questions to prove who did it and how. It is a calm, single-player game for iPhone and Android with no graphic content, built around comparing what people said with what the phone recorded.
A scenario: You are on a late train home and open a case. The victim's last message to her sister says she is "staying in tonight." Three swipes later, a photo in her gallery is stamped 23:10 at a bar across town. You say nothing, but you sit up a little straighter. By the time the train reaches your stop, you know which friend lied about seeing her that night.
Key takeaways
- Each case gives you one object: the victim's unlocked phone.
- Messages show relationships; the call log and timestamps give you the clock.
- Some photo albums are locked until you find the code hidden in the evidence.
- You win by answering who and how, not by tapping a suspect's face.
- No graphic violence: the tension comes from contradictions, not images.
Imagine a stranger picking up your phone tomorrow. Who you texted last. Which call you ignored three times. The photo you took and never posted. Nobody types a confession, but almost everyone leaves a trail.
That trail is the premise of Cold Crime: Murder Mystery, a mobile detective game we built alongside the Forgotten Mystery cold case files. Instead of police paperwork, you get one object: the victim's phone, unlocked and in your hands. Everything you need to solve the case is inside it.
The Premise: One Phone, One Case
Every Cold Crime case starts the same way. Someone has died, the case has gone cold, and the victim's phone is now yours. You read the messages, scroll the call log, open the photos and go through the notes. When you think you understand what happened, you answer the case file questions to prove who did it and how.
There's one more layer. Some photo albums are locked until you find the code hidden in the evidence. The code is never random. It sits in a message, a note or a detail you may have skimmed past, and finding it usually means you now understand something about the victim you missed a few minutes earlier.
What you won't find is graphic violence. Cold Crime keeps the crime off screen. The tension comes from the evidence, the contradictions and the moment the story clicks.
How a Case Plays Out in This Mobile Detective Game
There's no single correct route through a phone. Still, most cases follow this rhythm.
1. Get to Know the Person
Before you look for a killer, find out who the victim was. Skim the latest conversations. Who did they talk to most? Who were they avoiding? Were the messages warm, tense, formal? A phone maps someone's relationships faster than any police report, and relationships are where motives live.
2. Build a Rough Timeline
The call log and message timestamps are your clock. Note when the victim was last active, who they last spoke to, and any gap that breaks their habits. A missed call at an odd hour can outweigh a long, dramatic conversation.
3. Check the Apps Against Each Other
Here the case cracks open. A message says one thing; a photo, a note or a call record says another. Someone claims they were never in touch, but their number shows up in the log. A plan is made in a chat and quietly changed in a note. Contradictions between sources are the heart of Cold Crime, just as they are in our browser case files.
4. Unlock What's Hidden
Sooner or later you'll hit a locked album. Treat it as a question: what would this person use as a code, and where would the answer be? When it opens, the new material often changes the meaning of everything you've read.
5. Answer the Case File Questions
You answer questions about who did it and how, so your theory has to hold up, beyond pointing in the right direction. If you guessed the right name for the wrong reasons, the questions usually expose it.
We built Cold Crime around one rule: you solve each case using only the victim's phone, its messages, photos and notes. All cases in the app are free.
Why the Phone Format Works So Well
Detective games always need a container for evidence. Board games use cards. Mail-order mystery boxes use envelopes of printed documents. Our web cases use a police file. Why a phone?
Everyone already knows how to read one. There's no rulebook. You know what a message thread looks like, what a missed call means and how people write notes to themselves. The interface disappears and only the investigation is left.
Phones are honest in a way people aren't. In an interrogation, the suspect chooses what to say. On a phone, the record just sits there. Timestamps don't get nervous. If you like that kind of reasoning, our guide on how to analyze clues works the same skills from another angle.
It feels personal. Reading someone's private messages is uncomfortable in a way a typed report isn't. That discomfort gives the victim weight: a person whose last days you're trying to understand, not a puzzle piece.
It fits the device in your hand. The game is built for the screen rather than squeezed onto it. Read a thread on the bus, then return to the call log later with fresh eyes.
Cold Crime Compared with Other Ways to Play
| Format | Evidence you work with | Where you play | Best for |
|---|---|---|---|
| Cold Crime: Murder Mystery | The victim's phone: messages, calls, photos, notes | iPhone and Android | Short sessions, reading personal evidence |
| Forgotten Mystery cases | A full police file: reports, forensics, records, interrogations | Browser, iOS and Android | A complete investigation in one sitting |
| Interrogation Room: Murder | Your own questions and the suspect's answers | iOS and Android | Catching a suspect in a contradiction |
| Printable cold case file | Printed documents on your table | At home, alone or in a small group | A long, hands-on evening |
Who Cold Crime Is For
- Players who like reading evidence. If documents appeal to you more than action, this is your game.
- True crime fans who don't want graphic content. The focus is the investigation; nothing gruesome appears on screen.
- Fans of our browser case files. Cold Crime uses the same core skill, comparing what people say with what the evidence shows, in a different container.
- Solo players. It's a calm, single-player experience. For more along those lines, see our list of the best solo mystery games.
Skip it if you want fast reflexes or a multiplayer party game. Groups are better served by a hosted murder mystery night or a pass-the-phone party game.
Tips for Your First Case
- Read slowly at first. The first messages set up the relationships everything else depends on. Rushing them is the most common reason people get stuck later.
- Keep paper nearby. Jot down names, times and anything that looks like a number or a date. Codes hide in exactly that kind of detail.
- Go back when something doesn't fit. If a photo or a note surprises you, reread the conversation it relates to. The contradiction is usually the clue.
- Tell "suspicious" apart from "impossible." Someone being rude or secretive is suspicious. Someone saying they were somewhere the evidence shows they couldn't have been is impossible. Build your case on the second.
- Don't commit to a suspect too early. The first person who looks guilty is often written that way. Ask what else would have to be true if they did it, and check.
- Take the "how" as seriously as the "who." The case file questions care about method too.
Download the Cold Crime Detective Game
Cold Crime: Murder Mystery is available for iPhone and Android:
If You Like Cold Crime, Try These
Forgotten Mystery: Murder Case is the app version of the cold case files on this site. Where Cold Crime gives you a phone, Forgotten Mystery gives you the full file: police report, crime scene inspection, forensic results, bank records, camera timestamps and interrogation transcripts. You can play it in your browser or download it for iOS and Android.
Interrogation Room: Murder flips the perspective. Instead of reading a record, you sit across from the suspect and choose your questions each turn. The answers go into your notebook, and if the suspect later changes the story, the contradiction is exposed. Careful: their patience runs out. Interrogation Room on the App Store (also on Google Play).
Murder OX: Mystery Puzzle Game suits short sessions. You get a few statements and mark each one true (O) or false (X); a case takes about two minutes. You can see all our games in one place on the games page.
FAQ
What is Cold Crime?
Cold Crime: Murder Mystery is a mobile detective game played on the victim's phone. You read messages, the call log, photos and notes, unlock hidden albums with codes you find in the evidence, and answer the case file questions to prove who did it and how.
Does Cold Crime have graphic or violent content?
No. Nothing gruesome appears on screen. The game is about evidence and contradictions, so it suits mystery fans who avoid graphic content.
What devices can I play it on?
Cold Crime is available for iPhone on the App Store and for Android on Google Play.
Is Cold Crime free?
Yes, the cases in Cold Crime are free to play. Download it from the App Store or Google Play and start with the first case.
How is it different from the Forgotten Mystery cases?
The cases on this site give you a full police file with reports, forensic analysis, records and interrogation transcripts. Cold Crime narrows the evidence down to a single personal object: the victim's phone. The core skill is the same: compare what people say with what the record shows, and follow the contradiction.