R9-17 / Logic Protocols

Echo Sequence

Repeat an expanding four-channel transmission from memory.

Typical run: 3 min
Input: Pointer
Storage: Local only

Calibrating Echo Sequence…

Operator manual

← Browse all games

How to play

Watch the channel sequence, then reproduce it in order.

Controls

Click, tap, or use keys 1–4.

Rules & result

Every round adds one step. A wrong channel ends the run.

Scoring tip

Group long patterns into pairs and quietly name the channel numbers.

How Echo Sequence 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 / R9-17

Protocol notes

When can I press?+

Wait until playback ends and the status reads Your turn.

Is sound required?+

No. Every cue has strong visual and text feedback.