5 cases · ages 15-20 · free

5 investigations that really make you think.

Five cases across four chained rooms. Each room produces a piece of evidence filed in your case file and needed for the next; the last one is a report where you cross-check the evidence and defuse the traps. 5 challenge levels, randomized playthroughs, built on real facts.

5cases
5levels
4chained rooms
100%free
Five levels

The higher you go, the less hand-holding

  1. 1Ages 15-16Fundamentals: clear hints, 2 traps, guided conversions
  2. 2Ages 16-17Method: reduced guidance, data analysis
  3. 3Ages 17-18Rigour: calculations to do yourself, more traps
  4. 4Ages 18-19Critical thinking: thorough cross-checks, subtle decoys
  5. 5Ages 19-20Expert: university-level reasoning, decoys, tight tolerances
The cases

Five hypes to fact-check

Real facts, fictional cases. Each time, someone is wrongly accused or an announcement goes too fast.

Neuroscience & critical thinking4 rooms

The Mind-Reading Machine

A startup claims an EEG headset “reads thoughts” at 95%. Before the press conference, unmask the muscle artifact, the p-hacking and the lack of replication.

  1. 1The signal (EMG artifact or thought?)
  2. 2The “95%” (multiple comparisons)
  3. 3The blind replication
  4. 4The opinion before the press
Particle physics4 rooms

The Faster-Than-Light Neutrinos

Inspired by the OPERA affair (2011): neutrinos seem to beat light by 60 ns. A discovery… or a loose cable? Hunt the systematic error.

  1. 1The measurement (6σ: chance or bias?)
  2. 2The timing chain
  3. 3Counter-check and SN 1987A
  4. 4Publish or correct
Forensics & cybersecurity4 rooms

The Data Leak

A customer database leaks and an admin is wrongly accused. Time zones, a supply-chain attack and hash-based attribution to set the record straight.

  1. 1The timeline (UTC vs local)
  2. 2The vector (tampered dependency)
  3. 3The attribution (IP, token, hash)
  4. 4The board meeting
Epidemiology (John Snow)4 rooms

The Source of the Outbreak

An outbreak hits a town; a student and a lab are wrongly accused. Case map, incubation and a phylogenetic tree to find the real source.

  1. 1The case map (John Snow)
  2. 2The incubation period
  3. 3The phylogenetic tree
  4. 4The public meeting
On-chain financial forensics4 rooms

The Vanished Funds

A crypto platform collapses, $80M vanish, the developer is accused. Trace the funds on the public ledger and expose the real guilty key.

  1. 1The tracing (the ledger is public)
  2. 2The fake proof of reserves
  3. 3The signing key
  4. 4The hearing
The method

Think like a scientific investigator

Chained evidence

Each room produces a piece of the case file. Without it, the next room cannot be solved.

Real facts

OPERA (2011), John Snow (1854), the fMRI “dead salmon”, on-chain tracing: the cases are fictional, the science is not.

Critical thinking

Multiple comparisons, systematic error, time zones, fake proof of reserves: the biases headlines forget.

A final report

You cross-check the evidence to clear someone or deflate an announcement. The decoys are built to catch hasty conclusions.

The other worlds

An adventure for every age