Real demand
It substitutes for escape-room style offline puzzle spending, moving the experience home and extending it online; a repeat-purchase rate above 38% shows players come back for the next case rather than buying once.
Real-revenue cases
$8K Per Month Side Project Helping People Solve Murder Cases - Starter
Real demandA Belgian federal police officer sells fictional cold-case kits: buyers get a mock police file, evidence bags and photos, then investigate online via fake social profiles, a fictional police database and a chatbot to catch the killer.
- Startup cost
- $5,000
- Primary source
- View original
01
Real-demand verdict
Customers buy a physical case box outright (average price around $35) at roughly 43% gross margin, with plans to move to a monthly subscription box.
Offline puzzle entertainment such as escape rooms
02
Where the first customers came from
A roughly $200 Facebook ad test collected over 1,000 emails; pre-orders opened a month before the first shipment, and an email to that list produced 100+ orders within four hours.
03
Tactics you can copy
- 01Validate the concept with a small Facebook ad spend and build an email list before launch, then fund the first production run with pre-orders; the founder started with only $5,000.
- 02Run Facebook page contests where users tag a friend, then use a chatbot to auto-subscribe participants to Messenger, lifting open rates from 25% on email to 95%.
- 03Test hundreds of photo creatives on Instagram Stories ads at about $0.08 per visit, then retarget those visitors.
Moving it to an AI business
The transferable parts are the cold-start and retention structure: cheap ad tests, pre-order funding, and pushing users into a high-open-rate chat channel. For an AI product, the chatbot role can be played by an AI assistant, but what sustains repeat purchase is a steady stream of new content (a new case each month), which applies to AI products too.
04
Evidence and limits
Founder interview, self-reported
Revenue basis · Founder self-reported, unaudited (see source page)
What evidence is missing
The page header claims $85K monthly revenue while the founder says just over $8,000, and the source does not reconcile the two.
No retention data beyond repeat-purchase rate, so long-term churn is unknown.
The online components (chatbot, fake database) appear self-built; the source does not specify how much AI or automation is involved.