Teachers

Two plans, both with a 14-day free trial: €9.99 per month with no commitment, or €79 per year. A card is required at sign-up and the charge goes through when the 14 days end unless you cancel. Both open exactly the same features and can be cancelled at any time from your account.

Yes, and without creating an account. On the Teachers page, the button “Try one of the investigations” sets everything up for you: a guest session, correction turned on, then the first free investigation in the language of the page. You play the real game, with the real corrections, exactly what your students will experience. The subscription then opens every investigation, including the paid episodes, plus class sessions: the code to share, the tracking board and the language you set for the whole class. And to go further with a real class, both plans start with a 14-day free trial, with nothing charged before day 14.

From your Teacher space, create a session: pick the investigation and the interrogation language. You immediately get a code, a link and a QR code to share. Your students join on their own device, in the browser, with no account and nothing to install. During the lesson, the live board shows you who is moving forward, who is stuck and who has solved the case. After the session, the My classes page keeps the class's progress, session after session. Creating a session takes about two minutes, with nothing else to prepare.

Two ways: project the QR code for them to scan, or share the session link by copy-pasting it (school platform, Teams, email). Both lead to the same page: the student picks a nickname and plays, no account, nothing to install.

Each student scans the QR code or opens the link, picks a nickname and enters the investigation. Students chat in writing with the story's characters: they ask their questions freely, in the session language, and the suspects answer while staying in character. Every message is corrected as the conversation goes (spelling, grammar, conjugation, clarity) and the correction stays visible in the bubble. The goal: cross-check the testimonies and accuse the right suspect before the end of the lesson.

Up to 40, each on their own device, in the browser, with nothing to install.

From about age 10, as soon as they read and write comfortably. In a foreign language, the real criterion is the level: count on A2 in the session language to follow the investigation and ask simple questions, B1 to get the most out of it, B2 to spot the contradictions between statements. Below A2, free writing remains too demanding. The correction itself adapts to what each student writes, whatever their level.

Yes, the Teacher plan is built for the classroom. The investigations rely on reasoning, observation and logic, with no disturbing scenes. Conversations with the characters stay within the investigation and are moderated, and students cannot communicate with each other. Your students play under a nickname, with no account and no email address. You choose the investigation and the language, you follow the whole class on the session board, and each student's mistakes are visible to you only, never shown in a ranking.

First, written expression in the language you teach: students freely word their questions to the suspects, and every message comes back corrected on four axes, spelling, grammar, conjugation and clarity. Then reading comprehension, since they have to read the characters' answers and draw the right conclusions. Finally, logic and deduction: cross-checking testimonies, spotting contradictions, accusing the right suspect. In small groups, students compare their deductions and practise cooperation too.

Because they write, and a lot. One session means dozens of questions freely written in the language of your lesson, in a concrete situation that motivates more than a standard exercise. Every message is corrected as the conversation goes and the correction stays visible in the bubble: students see their mistake the moment they make it, without the game stopping. Session after session, the My classes page shows how the class evolves on each axis, so you can spot what still needs work.

The game exists in seven languages: French, English, German, Spanish, Italian, Dutch and Portuguese. You choose the interrogation language when creating the session, whatever the language of your students' screens, and you can change it from one session to the next.

None. Students play without accounts, under a first name or nickname they choose. The session board is visible to you alone and session data is deleted automatically. After the session, we keep only class totals: number of questions, mistakes per axis, cases solved. No data can be traced back to a student. These totals are kept for two school years.

Yes. Many schools reimburse the subscription when you present an invoice in their name. From your account: open the menu via your avatar, at the top right, Subscription section, then “Manage my subscription”. In your Stripe billing space, replace your name and address with your school's. Each invoice uses these details at the moment it is issued: do it before the end of your trial, as the first invoice arrives then. You can then download all your invoices from the same place. Invoices already issued are not changed.