Rules with a catch
From level 3, two properties have to hold at once, like “floats and fits in your pocket”. The ball floats but is too big. The coin fits but sinks. From level 7, exceptions join in, such as “anything but tools”.
Key yes, coin no.
What's the rule?
You sort objects into two boxes, Yes or No. Nobody tells you the rule. Get five right in a row and it's revealed. On the phone next to this text, someone is playing right now. Let's see who spots the rule first.
Free · plays offline
9:41
Streak 0
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What does this object have that the earlier ones didn't?
Yes
No
Not solved yetCan you see the rule yet?
The padlock belonged with the key. Only the app will tell you why.
Do you see it? Solve it yourself in the app, coming soon
Free All 133 rules can be solved without buying anything.
Your Codex Every rule you solve goes into your book, so you can see how far you have come.
New every day At midnight a new daily rule drops, the same one for everyone.
How it works
One round in six pictures. Keep scrolling and the phone follows along.
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An object sits at the top
Every round has a rule you don't know. Below are two boxes, each already holding one example. The coin fits the rule, the spoon doesn't.
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You drag it into a box
Yes if you think it fits the rule. No if it doesn't. Instead of dragging, you can also just tap a box.
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A check means you're right
The ball now sits next to the coin. Up in the corner, the first of five dots fills in.
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A cross means you're wrong
You put the apple in No. It flies over to Yes anyway, because that's where it belongs, and your streak starts over. Mistakes like this teach you the most.
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The boxes are your evidence
Coin, ball, apple, egg in Yes. Spoon, feather, key, bottle in No. What do the first ones have that the others lack?
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Five in a row and the rule is revealed
This time it was “Round”. After three crosses the round is over, and you get to see the rule anyway.
After the first rule
133 rules in eight chapters, plus a new one every day for everyone. Early on, a single property is enough. Later it gets trickier.
A cross is information
You're torn between “round” and “from nature”. So you put the ball in Yes, because it only fits your first guess. If you get a cross, “round” is out. It costs you a life, but now you know more.
The Codex
Every rule you solve goes into the Codex as a card, with your first hit and the solve rate across all players. It's sorted by the eight chapters.
The daily rule
Every day there's one rule for everyone, and you get one try. You share your result as a row of squares. Anyone who sees it knows how you did. The rule itself stays secret.
Like an old museum.
Paper, ink and copper engravings. Color only shows up as feedback: green means right, terracotta means wrong.
Frequently asked questions
What if I can't figure out the rule?
Look in the boxes. What do all the objects in Yes have that none in No do? If that doesn't help, light the lantern. Once per round it's free and tells you what the rule is about: material, shape, physics or use. A second lantern costs two diamonds and shows you an object that belongs.
What happens when I get three crosses?
The round is over, and you still get to see the rule. It costs you a life. You have three, and each one comes back on its own after an hour, even with the app closed. If you don't want to wait, five diamonds refill them.
Do I have to spend money?
No. You earn diamonds by solving rules, and the daily rule gives you three. You can also buy them: 10 for €0.99, 65 for €4.99, 150 for €9.99. There's no subscription and no ads.
Do I need an account? What happens to my data?
There are no accounts. Your progress lives only on your phone. For the daily rule, the app anonymously sends whether you solved it and in how many moves. That's where the solve rate across all players comes from. Details are in the privacy policy.
Is it suitable for kids?
Content-wise, sure: no violence, no ads, no chat. They should be able to read, though, since the objects have names and the rule appears as text at the end.
Is the game available in English?
Yes. The app follows your phone's language: English, or German if your phone is set to German.
Does it work on tablets?
Yes, on iPad and Android tablets, always in portrait. It's built for phones, though. A round takes 60 to 90 seconds.
Will my progress move to a new phone?
Only through Apple's or Google's device backup. There's no account it could move with. The same goes for purchased diamonds.
One rule. The same for everyone.
One try.
A new daily rule arrives at midnight. You get one try, and you can share your result without giving anything away.