The world of circuits
Place logic gates and light the lamp: 10 free circuits right here, then Bit's Journey and the daily challenge.
Light the lamp, rebuild the picture, crack the code.
Learn how logic gates work by playing, for curious kids and adults. Three worlds of puzzles, free to start, no sign-up, on your phone or your computer: circuits to wire, beautiful pictures to put together, escape games to print.
Choose your world
The world of pictures
Beautiful pictures to rebuild piece by piece, from 24 to 500 pieces, with a free puzzle of the day. In English.
Escape games to print
Four printable escape games, in English: a scrambled robot in Professor Volt's Lab, a forest to relight with the fireflies, a lighthouse to relight in the fog, an observatory dome to open before the comet goes by.
Off by default. Pick an ambience, then press Play.
Well done, you've finished the 10 free circuits! Next up: Bit's Journey, 150 circuits in
12 chapters, free with 3 new circuits a day.
How to play
1Tap a “?” box to place a gate: AND, OR, NOT, XOR…
2Flip the inputs (A, B…): the wires carrying a 1 light up as the current flows.
3When every row of the table is green, the lamp lights up. Circuit solved.
The three worlds, in a few words
Circuits. Each one is a small circuit: switches A, B and C, empty boxes, and a lamp. Tap a box to place a gate (AND, OR, NOT, XOR…), flip the switches, and the lamp lights up when every row of the truth table is green. The first 10 circuits are free; Bit's Journey then gives you 150 circuits in 12 chapters, free with 3 new circuits a day, and the Pass (€5) unlocks them all at once: play the free circuits, follow Bit's Journey or take the daily challenge.
Pictures. 147 pictures in 17 collections (animals, sea, space, crystals…), from 24 to 500 pieces, playable with a finger, a mouse or the keyboard. They are AI-generated on our own computer, then hand-picked; 4 of them are real NASA photos of nebulae. The jigsaws are free; the HD wallpaper collection (€4.90) gives you every picture without a watermark, for your PC and your phone: play the jigsaws, see the HD collection.
Escape games. Four escape games to print at home, for 2 to 6 players, in English: Professor Volt's Lab (ages 12 and up, about an hour, €12), The Fireflies' Forest (ages 10 and up, 45 to 60 minutes, €12), The Misty Lighthouse (ages 10 and up, 60 to 90 minutes, €12) and The Forgotten Observatory (ages 10 and up, 60 to 90 minutes, €12). The first two also come together for €19 (both escape games), and all four for €34 (all four escape games). Everything else is on our offers page.
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Bit's Journey
150 circuits in 12 chapters, three ways to play: place the gates, set the inputs, fix the broken gate. Free: 10 circuits today, then 3 new ones every day. In a hurry? The Pass unlocks everything.
The daily challenge
One circuit a day, the same for everyone. Light the lamp, share your score and keep your streak going.
Learn logic gates
One page per gate, with the truth table, real-life examples and a circuit to play, then four questions to check what you remember. Use them to revise, prepare a lesson or see what goes on inside a chip.
AND · OR · NOT · XOR · NAND and NOR · Truth table
Do you teach logic gates?
Computing, physics, design and technology, electronics or a club: the “Learn” pages work as a lesson, the circuits can be projected on the board, and six ready-to-teach lessons are available in English.