A quarter turn at a time

The circuit puzzle you can finish on a coffee break

Every board is one connected circuit, scrambled. Turn tiles until power from the source reaches every bulb. No account, no ads, no timer pressure. Just the click of a tile locking into place.

Play today's board ↑

How it works

  1. ⚡

    Find the source

    The tile with the bolt is where power starts. Wires connected to it glow.

  2. ↻

    Turn the tiles

    Tap to rotate a quarter turn. Hold to lock a tile you are sure about. Undo if you change your mind.

  3. 💡

    Light every bulb

    When the last bulb glows, the board is solved. Your time, moves and par are recorded.

One board a day, for everyone

The daily board is the same for every player and changes at midnight UTC. Race the leaderboard, keep your streak alive, and come back tomorrow for a new one.

Par and perfect solves

Each board has a provable minimum number of turns. Match it and you earn a Perfect badge. It is the goal that keeps experienced players coming back after the time goal gets easy.

Share without spoilers

One tap copies a result card: an emoji grid of how efficiently you played each tile, your time and moves, and a link that carries your time as a challenge. Your friend plays the same board and learns if they beat you.

Five sizes and wrap-around

From a quick 5×5 to a 12×12 expert board. Turn on Wrap and the edges connect to each other, so nothing is given away at the border.

Quarturn share card: a glowing circuit board with two bulbs lit

Built for sharing

Every board has a link. Send one and your friend opens the exact same puzzle. Add your time and it becomes a challenge. Works in any chat app, no install required.

Install it anyway: Quarturn is a progressive web app that works offline and opens like a native game.

Questions

Is Quarturn free?
Yes. No ads, no energy timers, no paywall. Play in any browser or install it as an app.
Do I need an account?
No. You can play immediately. A private guest profile is created on your first move so your best times and streak are saved; link Google later to keep them across devices.
What is the daily board?
One shared 7×7 board for everyone, changing at midnight UTC, with a leaderboard and a streak.
What does par mean?
The fewest quarter turns that can solve a board from its starting position. Solve in exactly par for a Perfect badge.
How do challenge links work?
Share result copies a link that carries your time. Whoever opens it plays the same board and is told whether they beat you.