Crack the rule No equipment

Green Glass Door

You can bring a kitten through the green glass door, but not a cat. Work out the secret rule by guessing.

the best bit: finally getting it, then refusing to explain it to anyone else

Players
3–20 (best with 4–10)
Time
10–30 min
Learn in
Seconds
Mood
Chill
Format
Nobody keeps score
Teach mode: one step at a time

The 30-second version

One player knows the secret of the green glass door and gives examples of what can and can't go through it. Everyone else suggests things until they work out the rule. Once you've got it, you help give examples to the people who haven't.

honestly, just read this out and go.

Grab these

Nothing at all. just your people.

Set up

  1. One player needs to know the secret: only words with a double letter can go through the green glass door. Green, glass and door all have one. Don't tell anyone else.

How to play

  1. Give examples

    The player who knows starts: "I can bring a kitten through the green glass door, but not a cat. I can bring coffee, but not tea."

  2. Ask

    Everyone else asks about things: "Can I bring a dog?" "No." "Can I bring a puppy?" "Yes!"

  3. Prove it

    Think you've got it? Don't say the rule. Give your own example instead: "I can bring a balloon, but not a kite." The player who knows says if you're right.

  4. Join in

    Once you've got it, start giving examples too, until the last person cracks it.

How to win

Nobody wins. The last person to get it gets plenty of sympathy.

Once you know it

Make your own door
Once everyone knows this one, invent a new secret rule, like only words that start and end with the same letter.

From experience…

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