Just logic puzzles. Nothing to unlock.
Inferlo is a logic grid puzzle game in the style of Einstein's riddle. Read a few clues, mark ✗ and ✓, and find the one answer. Every level is open from the start, with no keys, no block mini-games and no coins.
Get it on Google PlayNo account · works offline · supported by ads, never while you solve
A logic grid puzzle gives you a few people, a few categories (pets, drinks, jobs, cities, ages) and a list of clues. Every person matches exactly one item in each category. You use the clues to rule out impossible pairs with ✗ and confirm the right ones with ✓ until only one arrangement is left. Inferlo generates each puzzle on your phone and checks it with a solver, so every grid has exactly one answer that you can reach by logic alone.
Every level open
Easy (3 categories × 4), Medium (3 × 5), Hard (4 × 4) and Expert (4 × 5) are all playable from day one. No keys to earn.
One answer, always
A built-in solver checks every puzzle: one solution, no contradictory clues, no guessing needed.
A fresh grid every day
The daily puzzle is the same for everyone today. Keep a streak and replay any missed day from the last 30.
Unlimited, never repeating
New puzzles are generated on demand, so you never run out or see the same grid twice.
Tap once ✗, twice ✓
Placing a ✓ fills the rest of its row and column with ✗ (you can turn it off). Tap a clue to cross it out.
Free hints
A hint points out a wrong mark or reveals one pair. Hints are always free, with no coins or videos.
Readable on a phone
Big clue text, a zoom button for larger grids, unlimited undo and dark mode.
Home screen widget
See today's puzzle and your streak at a glance. One tap opens the app.
FAQ
- Do I need to unlock levels or play mini-games?
- No. Every level is open from the start. There are no keys, coins, energy or block mini-games in Inferlo.
- Can a puzzle have more than one answer?
- No. Each puzzle is checked by a solver before you see it. It has exactly one answer and you can reach it by logic without guessing.
- Is it the same as Einstein's riddle or a zebra puzzle?
- Yes, it is the same family of puzzles. Inferlo uses smaller grids (3 or 4 categories) so one puzzle takes about 3 to 15 minutes.
- What if I get stuck?
- Use a hint. It first checks for a wrong mark and clears it; if all your marks are right, it reveals one correct pair. Hints are free and unlimited.
- Does it work offline?
- Yes. Puzzles are generated on your phone. No account and no internet connection are needed to play.
- Are there ads?
- Yes, Inferlo is supported by ads. A small banner sits below the screen, and full-screen ads never appear while you are solving a puzzle.
- Will my progress be saved?
- Yes, after every tap. You can leave a puzzle and continue it later from the Today screen.
- What data does Inferlo collect?
- There is no account. Your progress and stats stay on your phone. Ads are served by Google AdMob; see the privacy policy for details.
Guides
Inferlo is an independent app. It is supported by ads; full-screen ads never appear while you are solving.