A fascinating game that combines arithmetic and logic, perfect for older children and adults.
From the All Eyes on Me retro party-game collection, this old-fashioned favourite brings simple fun to a modern gathering.
At a glance
Players: 2+ players.
You will need: Paper and pencils.
Cost: Free instructions; use items you already have. Optional props or prizes may cost extra.
How to play
- Try The Magic Nine: multiply 9 by a positive whole number. Add the result’s digits, then keep adding until one digit remains: it will be 9. Example: 9 × 27 = 243; 2 + 4 + 3 = 9.
- Set the Century Puzzle: keep the digits 1–9 in order and insert plus or minus signs, allowing joined digits, to make 100.
- Give players five minutes to find a solution before sharing this example: 123 − 45 − 67 + 89 = 100.
- Try a Number Reveal: choose a number, double it, add 10, halve the result and subtract the starting number. The answer is always 5.
- Invite players to explain why each trick works. Score for clear explanations as well as speed.
Host’s tip
The repeated digit-addition step matters: a first digit sum can be 18 or 27 rather than 9.
Agree on the rules before you start. Guests can join, adapt a movement or pass; use points or optional playful challenges wherever the retro rules mention forfeits.
About this retro collection
Refreshed from the original All Eyes on Me party-game collection and supplied game notes, with language and practical adaptations for today’s celebrations. View the archived collection.