The Snow Formula
Without the Formula, no snow at Christmas.

Someone has stolen the Snow Formula from Professor Winter’s lab. Commissioner Conti calls in the children as scientific consultants: ten pieces of evidence hidden around the house, four suspects and an online Terminal where the codes go. Every riddle hides a real phenomenon, and at the end the deep dives explain what was discovered.
- Players
- 1–4
- Duration
- 75′
- Age
- 8+
The printable PDF is delivered by email. Nothing to ship, no account.
Difficulty I · Easy — the threshold
How to play
One entrance, one way out.
After purchase you receive a printable PDF by email, in Print-at-home kit format. Nothing to ship and nothing to wait for: print it, set it up and begin.
Inside the kit
What you print, what you need.
The kit files
- 110 pagesCan stay on screen
Instructions for the organiser
How to print, prepare and hide the evidence. No solutions inside.
- 226 pagesPrint it
Game material
Letters, evidence, numbered tags, a 4-sheet map, buildings to assemble.
- 37 pagesCan stay on screen
Solutions
Answers, hints and the full story. Keep it away from the children.
- To print
- Only the game material (26 pages). Instructions and solutions can stay on your phone or computer
- Format
- A4 PDF, to print at home
- Printing
- Colour, normal quality, single-sided. It also works in black and white
- Paper
- Plain; light card recommended for the buildings in step 8
- Preparation
- About 40 minutes to print, cut out and hide (the day before is fine)
- Play
- 60–75 minutes, 1–4 children aged 8–10. Younger ones play as a team
- Online
- A Terminal with 5 audio clips from the Commissioner and 2 simulators, on phone or tablet
What you need at home
- Scissors and sticky tape
- A pencil for each child
- A clear glass full of water
- A mirror (the bathroom one is perfect)
- A bright window or a lamp
- A phone or tablet connected to the internet
- A free table about 60 × 45 cm for the map
- Two envelopes
Optional: Yellow paper for the tags · A small gift for the finale under the tree
The science in the evidence
- Mirrors
- Pixels
- Optical illusions
- Refraction
- Trajectories
- Travel times
- Solids
- Cryptography