R9-18 / Logic Protocols

Sudoku Micro

Complete a compact 4×4 logic matrix with no repeated signal values.

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

Calibrating Sudoku Micro…

Operator manual

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How to play

Fill every empty cell with 1–4 so each row, column, and 2×2 block is unique.

Controls

Select a cell, then use number keys or the on-screen number pad.

Rules & result

Fixed clues cannot change. The grid completes only when every rule is satisfied.

Scoring tip

Find rows with one missing value, then compare their columns.

How Sudoku Micro 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 / R9-18

Protocol notes

Is guessing required?+

No. Each compact puzzle has a logical solution.

Are errors shown?+

Conflicts are highlighted without revealing the solution.