Support

Help with Lemma

Lemma is a collection of logic puzzles. Every puzzle has exactly one solution, and every one can be solved by reasoning alone, without guessing. There is a new daily puzzle for each type, every day.

Nonogram

Fill cells so every row and column matches its numbers.

Shikaku

Divide the grid into rectangles, one number each, sized to match.

Star Battle

Place stars so every row, column and region has its share, none touching.

Hashi

Connect the islands with bridges to match their numbers.

Each type has a How to play page in the app with the full rules and every technique its puzzles use.

Contact

Questions, problems, ideas

developer.barseghyan@gmail.com

Email support

I usually reply within about two business days. If you think a puzzle is wrong, please read “I think a puzzle has no solution, or two” below before writing, and include what it asks for.

Frequently asked questions

Do the puzzles really have only one solution?

Yes. Every puzzle is checked twice before you see it: once by a solver that works the way a person does, step by step and never guessing, and once by a separate solver that counts every possible solution. A puzzle is shown only if both agree there is exactly one.

I think a puzzle has no solution, or two.

Please tell me. Send to developer.barseghyan@gmail.com:

the puzzle type, difficulty and size, or the date if it was a daily
a screenshot of the puzzle
if you can, a screenshot of where you got stuck

Before writing, try Check: it outlines any mark that does not match the solution. A single wrong mark early on is the usual reason a puzzle seems impossible later.

How are the difficulty levels decided?

By the hardest technique the puzzle needs. Easy puzzles yield to the simplest deductions. Harder levels need more advanced ones, and the hardest uses Contradiction: suppose a mark, follow the rules a short way, and see that it breaks them. The Solved card lists the techniques a puzzle took.

What are coins?

Coins are the game’s currency. You earn them by playing:

How	Coins
First launch	100
First open each day	20
Any puzzle solved	3
A daily solved	10 more
Solved without a hint	5 more
Streak of 7, 30, 100 days	50, 200, 500
Watching an optional video ad	25, up to 10 a day

You spend them on:

What	Coins
Hint: shows the next logical step and explains it	15
Check: outlines your mistakes	10
Streak freeze: keeps your streak through a missed day	100
A past daily from the archive	30

Today’s dailies are always free. You never need coins to play or to solve a puzzle.

I don’t have enough coins.

You can watch a short video ad for 25 coins, up to 10 times a day, or buy a pack in the Store. You can also simply keep playing: every solved puzzle earns coins.

How does the daily streak work?

Solve at least one daily puzzle on a day and the streak goes on. The day is your local calendar day, so traveling across time zones does not cost you a day, and changing the clock does not remove a day you already played.

If you hold a streak freeze, it is used automatically on a day you miss. You can hold up to two.

When do ads appear?

Never while you play, and never on top of the puzzle. A full-screen ad may appear when you leave a finished puzzle, at most once every three puzzles and at least three minutes apart, and never in your first session or before you have solved three puzzles.

Video ads for coins appear only when you choose to watch one.

What does Remove Ads do?

It turns off the ads that appear between puzzles, for good. It is a one-time purchase, not a subscription. Optional video ads stay available, so you can still watch one for coins if you want to.

The Starter bundle includes Remove Ads and 1,000 coins, as a one-time offer.

How do I restore my purchase?

Open the Store and choose Restore purchases. You must be signed in with the same Apple Account that made the purchase.

Coins you bought or earned are kept in your iCloud account, so they come back on a new device as long as you are signed in to the same iCloud account and iCloud is turned on for Lemma.

Does my progress move to a new device?

Yes, through iCloud: your statistics, streak, saved games and coins. Sign in to the same Apple Account on both devices and keep iCloud turned on for Lemma in Settings → [your name] → iCloud. Without iCloud, progress stays on the device it was made on.

Does the app work without a connection?

Yes. Puzzles are made on your device, so today’s dailies, your saved games and archive puzzles you have unlocked always open offline.

Because the free game is paid for by ads, and ads cannot load offline, you can start 3 new puzzles a day without a connection; after that the app asks you to reconnect. With Remove Ads there is no offline limit at all.

Can I get a daily reminder?

After you solve your first daily, the app offers one. It is off unless you turn it on, and you can turn it off in Settings or in iOS Settings at any time.

Why does the app ask to track me?

It asks so that the ads you see can be relevant to you. Saying no changes nothing in the game: you still get exactly the same ads, at the same rate, just not personalized. In the EU, the UK and Switzerland you are asked for consent first, and you can change that choice at any time under Settings → Privacy → Privacy options in the app. See the Privacy Policy.

Which devices and languages are supported?

Lemma runs on iPhone and iPad with iOS 17 or later. It is available in 18 languages: English, German, French, Spanish (Spain and Latin America), Italian, Portuguese (Brazil and Portugal), Dutch, Polish, Russian, Ukrainian, Turkish, Japanese, Korean, Chinese (Simplified and Traditional) and Armenian. The app follows your device’s language; to choose another one, open Settings → Language in the app.

How do I get a refund?

Purchases are made from Apple, so refunds are handled by Apple, not by me. Request one at reportaproblem.apple.com.