Logic puzzles for adults, online and free
Love brain teasers but bored of word searches and sudoku? Try something different: in Cross in a Box every game is a little mystery you crack with pure logic. Read the clues, rule things out, deduce… and find out who did it.
▶ Play free nowNo download, no sign-up. Start with The Academy: 5 very easy cases that teach you all the tricks.
A logic game you'll get in one minute
The board is a block of flats seen from the front: floors, columns and flats. Each neighbour gives a clue about where they were («there was a canary on my floor», «I was to the left of Toni»…). With three fixed rules, one neighbour per floor, at most one per flat and nobody shares a wall with anybody, you work out which room each of them was in.
Once everyone is placed, look for the open window: only one neighbour is in a room with an open window, and that's the culprit.
Made for adults (without being impossible)
No maths, no memory tricks: everything follows from the clues. Cases range from very easy to extreme, so you can start with a five-minute one on the bus and end up with one that keeps you thinking on the sofa for a good while.
Stuck? The 💡 Hint button looks at your own board and explains the next step of the deduction, or tells you if you've crossed out something you shouldn't have.
Why it's so addictive
- Every case has exactly one solution, and you never have to guess: there's always a line of reasoning.
- Timer and leaderboard: beat your own time or take on the world.
- Challenge your friends: send them a link to the same case and compare times.
- Free, in the browser on your phone or computer. No download needed.
▶ Play free nowNo download, no sign-up. Start with The Academy: 5 very easy cases that teach you all the tricks.
Frequently asked questions
What are good logic puzzles for adults?
The ones that make you reason step by step: logic grid puzzles, sudoku, nonograms, or deduction puzzles like Cross in a Box, where every clue rules out options until only one is left.
Are there logic puzzles online for free?
Yes. Every Cross in a Box case is free and plays in your browser, with no download and no sign-up needed.
Are logic puzzles good for your brain?
They exercise attention, working memory and reasoning. The key is that they stay challenging, which is why the cases get harder little by little.
How long does a game take?
Easy cases take 3 to 5 minutes; the hardest ones can take half an hour.