# Manual Checks

Run the UI locally before changing styles or input handling:

```bash
uv run oneup-solver --id gdAtCDwmk53JcW4wYTz3
```

Walk through these steps to confirm nothing regressed:

1. Load the board and verify the outer frame plus every thick wall render as single, continuous black strokes (no doubled edges or gaps).
2. The initial selection shows a blue outline inside the cell; moving with arrow keys keeps the ring inside the board without covering walls.
3. Type digits `1`–`9` or use the on-screen buttons to fill editable cells; fixed clues ignore input.
4. Clear with `0`, `Backspace`, or `Delete` and confirm the selection stays put.
5. Enter an out-of-range number or a duplicate within a segment to see the red cross on every offending cell (including clues), while walls stay visible.