13 packs, 141 secret rules
Spelling tricks, categories, chains, rules about the room you're in — and a new one every time you host.
The Green Glass Door gameCoffee's in.Tea's out.
Can you crack the secret rule? One player hosts, everyone else packs a bag — “I'm packing…” — and the host swipes pack or leave. Work out the rule, prove it, and pack your bag first.
- 📱 One phone
- 👯 3–12 players
- 🎁 2 packs free
- ✨ 3-day PRO trial
How to play
One secret. Who will crack it?
The road-trip riddle everyone knows, turned into a party game. A minute to learn — the host's phone does the rest.
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The secret rule
One player hosts. They hold the phone and secretly peek at a rule — like “two same letters in a row”.
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Can you bring it?
Everyone else takes turns: “I'm packing…” and any item. The host swipes Pack if it fits, Leave if it doesn't.
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Cracked it? Prove it!
Shout it, and the host taps Got it! Now name 3 fitting items in a row — one miss and the turn moves on.
- +3 · +2 · +1First, second and everyone after to pack their bag.
- The host scores tooA rule that's just right earns points. Too easy or too hard? Zero.
- Everyone hostsAfter each round the phone moves on with a brand-new rule.
- Stuck?The host can drop a hint — each one costs them a point.
Try it right here
What would you take through the door?
This is the classic rule from the free Glass Door pack. Type an item, see whether it gets packed, and crack the rule before you peek.
Hint: grandma likes coffee, but not tea. Give up? Read the answer.
Host: You
- coffee
- tea
- balloon
- cup
Pack it ✓ or leave it ✕ — what do the packed ones share?
Why it works at a party
Pass the phone. Lose your mind a little.
One phone, whole room
No accounts, no extra devices. Add 3 to 12 players, pick a host and pass the phone around the table.
Swipe to judge
Right to pack, left to leave, up for “Got it!”. The round screen keeps track of every turn.
Play at your pace
Quick, long, custom or no timer, and as many rounds as you like. Turn on hints, or let the host write down every item.
Scoring that keeps it fair
Packers score by place, the host scores for a rule that's just right. Undo a slip; a tie at the top gets a tiebreaker.
Family night to experts
The Kids pack keeps it simple for younger players; Hardcore and Tricks are sneaky enough to stump the room.
See it in action
From the pack to the podium.
13 packs
A rule for every kind of crowd.
Mix any packs you like — the host gets a random rule from the ones you picked. Glass Door and Categories are free.
- FREE
Glass Door
Secret spelling rules: coffee in, tea out
- FREE
Categories
What things are and what they're like
- PRO
Letters
Rules about letters and spelling
- PRO
Nature
Woods, water and everything alive
- PRO
Tricks
It's not what you say, it's how
- PRO
Hardcore
Sneaky rules for experts
- PRO
Kids
Simple rules for little ones
- PRO
Here & now
You and everything around you
- PRO
Backpack
Pockets, zippers and chargers
- PRO
Wordplay
Hidden words, sounds and spelling tricks
- PRO
Chain
Every item hangs on the one before
- PRO
Time
When you use it and how long it lasts
- PRO
Invisible
Things that won't fit in a bag
Free to start
Unlock the whole bag.
Play the Glass Door and Categories packs free. Go PRO when you want every pack.
WeeklyBilled every week
$7.99
Weekly + free trialFree for 3 days, then $7.99/week
$7.99
Yearly −89%Just $3.74/month
$44.99
3 days free, then $7.99/week. Renews automatically. Cancel anytime.
Good to know
Frequently asked questions
What is Green Glass Door?
Green Glass Door is a riddle game: things can go through the green glass door only if they follow a secret rule — coffee can, tea can't. The app turns it into a party game: one player hosts with a secret rule, everyone else takes turns packing a bag until they crack it. Read the classic riddle and its answer.
How many people can play?
From 3 to 12 players on a single phone. One person hosts each round and the phone moves on, so everyone gets to host.
How do you play?
The host peeks at a secret rule. Players take turns saying “I'm packing…” and an item; the host swipes Pack if it fits the rule or Leave if it doesn't. Think you've cracked it? Prove it by naming 3 fitting items in a row. See the full rules.
How does scoring work?
The first player to pack their bag gets +3, the second +2, everyone after +1. The host scores when the rule was just right: nobody cracking it, or everyone cracking it in a couple of turns, earns the host nothing. Hints cost the host a point each.
What's free and what's in PRO?
Free gets you the Glass Door and Categories packs — 24 rules. PRO unlocks all 13 packs and all 141 rules, with a 3-day free trial.
Is it good for kids and families?
Yes — it's played out loud around a table. The Kids pack keeps rules simple for younger players, while an adult holds the phone and hosts.
Do I need an account or internet?
No account and no sign-up — just type the players' names and start. The rule packs live in the app.
Which devices are supported?
iPhone, iPad and Android phones.
Ready for a round?
Grab your friends, pick a pack and see who cracks the rule first.