What happened?
🌐 English
Dark mystery puzzles you solve with yes/no questions

Dark mystery puzzles you solve with yes/no questions

In What happened? you read a baffling situation in one to three sentences and work out what really happened by asking yes/no questions. An AI game master knows the solution and answers every question you ask. Play solo, as a pair or with the whole group, on iPhone and Android.

Download on the App StoreComing soon Get it on Google Play

AI game master

The AI knows the solution and answers with Yes, No, Partly, Irrelevant or "Not a yes/no question". Type your questions or simply speak them.

Party mode without internet

One person reads the solution quietly, everyone else questions them. Group mode works without internet and without AI: perfect for road trips, game nights and parties.

100 original stories

Four packs (Everyday Life, On the Move, Work and Leisure) across three difficulty levels. Every story comes with its own woodcut illustration.

A clear goal

Every story has key facts. Once you have guessed them all, the case is solved: no arguing about whether you were "close enough".

Buy once, no subscription

12 stories are free. Packs are a one-time purchase at €2.99 each or €7.99 for all of them, and packs you own keep growing with new cases.

14 languages, zero tracking

Play in English, German, Japanese and eleven more languages. No account, no ads, no tracking.

How What happened? works

  1. Pick a story from one of the four packs and read the baffling opening situation.
  2. Ask yes/no questions, typed or by voice.
  3. The AI game master answers with Yes, No, Partly, Irrelevant or "Not a yes/no question".
  4. Guess all the key facts of the story and the case is solved.

Try it out: two puzzles

Think about the questions you would ask first, then open up the solution.

The Water Meter

The Water Meter

A woman in Hamburg glanced at her phone, went pale, and called the fire brigade in Munich. They broke down an apartment door there and found a dead man.

Show the solution

Her elderly father lived alone in Munich. To worry less, she had installed a smart water meter in his apartment and could track his usage in an app. Normally the curve showed his morning coffee, the toilet flush, the shower. For two days it had read exactly zero. She called the fire brigade at once, but her father had already died after a fall in the bathroom.

Half Past Two, Twice

Half Past Two, Twice

A bar's security camera shows Mr Brandt at the counter at exactly 2:30 a.m. At 2:30 a.m. that same night, 40 kilometres away, his business partner was shot dead. Brandt is convicted of murder anyway, and rightly so.

Show the solution

It was the night Germany switched from summer to winter time: at 3:00 a.m. the clocks went back to 2:00 a.m., so 2:30 a.m. happened twice. Brandt shot his partner during the first 2:30, used the hour he had gained to drive the 40 kilometres to the bar, and made a point of showing his face to the camera at the second 2:30. But his phone's cell-tower records, which are stored in universal time, showed he was at the crime scene for the first 2:30 and only reached the bar by the second, and the seemingly perfect alibi collapsed.

Frequently asked questions

What is What happened?

What happened? is a puzzle game for iPhone and Android in which you unravel baffling situations by asking yes/no questions. The format is also known as situation puzzles, lateral thinking puzzles or minute mysteries. An AI game master answers your questions, and in group mode one person from your circle takes over that role.

Is What happened? free?

You can play 12 stories for free, three from each of the four packs. More stories are unlocked with a one-time purchase: €2.99 per pack or €7.99 for all packs. There is no subscription.

How does the AI game master work?

The AI knows the solution to the story and judges every question you ask. It answers with Yes, No, Partly, Irrelevant or "Not a yes/no question". You can type your questions or use voice input.

Can I play What happened? offline?

Yes, in group mode: one person reads the solution quietly and answers everyone else's questions, with no internet and no AI involved. The AI game master, on the other hand, needs an internet connection.

What age is the game suitable for?

We recommend What happened? for ages 12 and up. The puzzles revolve around death, accidents and crime, but they are never explicit or gory. The humour is dark, not brutal.

How many puzzles are there?

There are 100 original stories in four packs: Everyday Life, On the Move, Work and Leisure. Packs you own keep growing with new cases, and a push notification lets you know when new stories arrive.

Do I need an account, and are there ads?

No. You do not need an account, there are no ads and no tracking. You download the app and start playing.

Which languages is What happened? available in?

The app is available in 14 languages: German, English, French, Spanish, Italian, Portuguese (Brazil), Dutch, Polish, Turkish, Swedish, Russian, Japanese, Korean and Chinese (Simplified).

More ways to play What happened?

Who is behind it?

What happened? comes from Codefellas GmbH in Hamburg. Managing directors Birger Krah and Daniel Sosa build apps and digital products with their team. Questions, feedback or a story that does not add up? Write to us at mail@codefellas.io.

codefellas.io

Ready for your first case?

Download What happened? and play 12 stories for free: no account, no ads, no subscription.

Download on the App StoreComing soon Get it on Google Play