Check-in game
🔢 Number Duel
One number, a few seconds to think – and a whole lot of strategy. Will the others pick 1? Then 2 is safe … or is everyone thinking exactly that? Number Duel is a mini game from game theory that takes seconds to explain and delivers surprisingly thrilling reveals.
- 2–20 players
- approx. 1 minute per round
- Free, no app
How Number Duel works
- Everyone secretly picks a number on their phone.
- Depending on the mode, the lowest number chosen by only one person wins, or the highest unique number – or whoever is closest to two-thirds of the average.
- The stage reveals all numbers one by one; duplicates are knocked out.
- In mixed mode, the rule changes every round.
Why Number Duel works
- No prior knowledge, no typing – works even with very quiet groups.
- The reveal is exciting every time and often surprising.
- A great fit for engineering, finance or product teams who love to think a step ahead.
Great for
- Daily stand-up
- Large groups
- Quick energizer
Examples
- Lowest unique number between 1 and 100
- Highest unique number
- Two-thirds of the average
- Mixed: a different rule every round
Tips for hosts
- With “Mixed”, the rule changes every round – which stops people settling into fixed strategies.
- After the ⅔ round, briefly explain why, logically, 0 should win. It's a guaranteed conversation starter.
FAQ
What is “two-thirds of the average”?
A well-known game-theory game: everyone picks a number, and the winner is whoever is closest to two-thirds of the average of all numbers. It reveals how many steps ahead your team is thinking.
More check-in games
- 🧠 Mind Reader – One clue, one secret position – how well do you know each other?
- 🐑 Herd Mind – Don't think original. Think like the herd.
- 📖 Bluff Dictionary – Invent an answer everyone believes is real.
- 🎯 Majority Bet – Answer anonymously – and guess how your team ticks.