R9-09 / Logic Protocols

Tile Shift

Restore a numbered navigation matrix one sliding tile at a time.

Typical run: 5 min
Input: Pointer
Storage: Local only

Calibrating Tile Shift…

Operator manual

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How to play

Slide tiles into the empty channel until the sequence reads 1 through 15.

Controls

Click or tap a tile beside the empty space.

Rules & result

Only orthogonally adjacent tiles may move. Solve the board to finish.

Scoring tip

Complete the top rows first and preserve finished sections.

How Tile Shift 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 / R9-09

Protocol notes

Is every shuffle solvable?+

Yes. Each board is created by legal moves from the solved state.

Can I undo?+

There is no undo, but a new solvable board is one tap away.