Read this out first

Green Glass Door

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.

Set up · 1 of 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 of 4

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."

How to play · 2 of 4

Ask

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

How to play · 3 of 4

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.

How to play · 4 of 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.