Casebook
Every clue has a place.
About the game
An expanding library of everyday mysteries, from simple elimination to layered deductions. Choose Starter, Intermediate or Expert, read the reliable records and find the person who fits every clue. Each case has a notebook, three optional hints and a step-by-step explanation. Play without a timer; progress stays in this browser.
- Players
- 1 player
- Controls
- Mouse, touch or keyboard
- Access
- Free, no account needed
Choose your kind of mystery.
Start small or follow a longer trail. Every level is open, with three optional hints in every case.
Starter
Find the facts. Rule out the impossible.
Intermediate
Combine records. Put events in order.
Expert
Follow connections through several deductions.
How to investigate
All the facts you need are in the file. No hidden rules, no guessing who is lying.
Read the case
Check the public rules, time and people first. Every evidence record is reliable.
Connect the clues
Open records for a closer look. Mark unknown, ruled out or possible in your notebook; the notes are yours to judge.
Check your answer
Choose the person who fits every clue. Try again after a wrong answer, or read the full explanation when you solve it.
Before you investigate
What are the three difficulty levels?
Starter uses straightforward elimination. Intermediate combines records and ordering. Expert asks you to follow several connected deductions. All levels are available from the start.
How many cases can I play?
The main library contains 15 cases across three levels. New cases can be added without resetting your existing progress.
Is there a time limit?
No. Starter targets 1-3 minutes, Intermediate 3-5 and Expert 5-8. These are design estimates, not measured averages. Take as long as you need.
Where is my progress saved?
Your answers, notes, hints and solved cases stay in this browser when local storage is available. They do not sync between devices. You can clear them in settings.
Can I replay a case?
Yes. Open a solved case and choose Investigate again. Your completion record remains while the new attempt starts with fresh notes and hints.