Logic puzzles for the classroom

Ten small logic puzzles, with a new board in each game every day. They run in any browser, on a projector, a laptop or a tablet. There is nothing to install, and nobody needs an account or an email address.

See today's ten puzzles

Why use them in class

Every board has exactly one answer, and you reach it by reasoning, not by guessing. Each move can be justified in one sentence: this tile must be dark because the row already has all its light ones. That makes the puzzles good practice at explaining a step, in math and beyond.

A board takes three to ten minutes, so it fits at the start of a lesson. Monday's boards are gentle and they get harder toward Sunday, so you can pick the day that suits your class.

Which game trains which skill

All ten train careful deduction. Each one also leans on a skill of its own:

Evenly (binary grid). Patterns and parity: half light, half dark, never three alike in a line. A gentle first puzzle for younger students. How to play Evenly
Wayfold (number path). Planning a route ahead and putting numbers in order. On the small 5×5 practice boards it suits younger students. How to play Wayfold
Parcels (shikaku). Area and factors: a 12 can be 2×6, 3×4 or 1×12, and the board tells you which one fits. Good for times tables. How to play Parcels
Rooftops (skyscrapers). Ordering and perspective: tall buildings hide shorter ones. Each height appears once per row and column, as in a Latin square. How to play Rooftops
Rowcall (nonogram). Adding and comparing block lengths across each row. The clues must add up exactly, and a picture appears at the end. How to play Rowcall
Starlit (star battle). Reasoning by cases and counting under constraints: if a row still needs one star and only two tiles are free, the star must be in one of them. How to play Starlit
Campfire (tents). Pairing and neighbors: every tree gets its own tent, and the edge numbers count the tents in each row. How to play Campfire
Lampwise (light-up). Spatial reasoning along rows and columns, and numbers that say exactly how many lamps touch a tile. How to play Lampwise
Shadeout (hitori). Spotting repeats and keeping one connected area: shading a tile must never cut the rest in two. How to play Shadeout
Lasso (slitherlink). Closed loops and the logic of edges. The hardest of the ten, for older students who like a long chain of steps. How to play Lasso

Ways to use them in a lesson

Warm-up on the projector: open today's board and let the class call out the next move. Ask for the reason before you make it.
Pairs on a tablet: one student solves, and the other has to agree with each move before it goes in.
The same board for everyone: the daily puzzle is the same for every player on a given date, so the whole class can compare times and methods.
Writing task: after solving, each student writes down the step that unlocked the board and why it was forced.

Past puzzles and practice boards

Every game keeps an archive of past daily puzzles, so you can give the class one you have already tried. Each game also has practice boards by size, from small ones for a first lesson to large ones for fast finishers.

Put today's puzzle on your class page

The embed tool gives you a short piece of code for any of the ten games. Paste it into a class website, a blog or a learning platform that accepts HTML, and the puzzle there changes by itself every day. The embedded puzzle shows no ads and sets no cookies.

Get the embed code

Students' privacy

There is no sign-up and no account. Progress and streaks stay only in the browser on that device. What we measure, and how to turn it off, is on the privacy page.

Questions

Is LogicSnack free for schools?

Yes. All ten games, the archives, the practice boards and the embed are free, with no account.

What age are the puzzles for?

Anyone who can count and follow a rule can start at about eight with Evenly, Wayfold or Parcels on small practice boards. The weekend's daily boards and Lasso suit teenagers and adults.

Do the puzzles work on school laptops and tablets?

Yes, in any recent browser. You play by tapping or clicking, and on a computer the keyboard works too.

Can students see the answer?

Each game has a Hint button that shows the next forced step and explains why. There is no button that fills in the whole board, so the class still has to reason.