R9-16 / Logic Protocols

Lights Protocol

Shut down a linked 5×5 console where every switch affects its neighbors.

Typical run: 4 min
Input: Pointer
Storage: Local only

Calibrating Lights Protocol…

Operator manual

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How to play

Toggle panels until every light is off.

Controls

Click or tap a panel. It toggles itself and orthogonal neighbors.

Rules & result

Complete the shutdown in as few moves as possible.

Scoring tip

Work row by row: use the next row to turn off the one above it.

How Lights Protocol works

The board is generated in the browser and validated against the protocol rules after each move. No network request is needed to create or solve a round. Restart creates a clean state without reloading the page, and optional records remain on this device.

Accessibility and devices

The game uses visible text feedback in addition to color. Controls are keyboard-focusable, touch targets are at least 44 pixels, and motion is reduced when your system requests it.

Questions / R9-16

Protocol notes

Is the puzzle solvable?+

Yes. Each board starts solved and is scrambled with legal presses.

Can I reset the same puzzle?+

Restart restores the current starting pattern.