Workshop › Sudoku › Step 6 of 28

The selected cell

What we are doing

One cell is selected: the one your next digit goes into. It starts in the middle and is painted blue.

```js
let selected
  selected = { r: 4, c: 4 }

      let fill = '#ffffff'
      if (r === selected.r && c === selected.c) fill = '#93c5fd'
      ctx.fillStyle = fill
```

What it means

• selected is a row and a column; reset puts it at the center, (4, 4).
• The cell's color starts white and becomes blue for the selected cell.

Your turn

1. Under let given, write let selected; in reset, set it to the middle.
2. In draw, choose the cell's color with fill.

Skills: Game states

← Keep drawing Light up row, column and box →

All steps

1. Nine by nine
2. Lines and boxes
3. A puzzle from a string
4. The puzzle's own digits
5. Keep drawing
6. The selected cell
7. Light up row, column and box
8. The same digit everywhere
9. Click to select
10. Move with the arrows
11. Write digits
12. The three rules in one loop
13. Show mistakes
14. Solved!
15. A clock
16. The solved message
17. Play again
18. The easiest cell
19. The solver
20. Random order
21. Invent a puzzle
22. A new puzzle every game
23. Hints
24. Best time
25. N for a new puzzle
26. A number pad
27. Tap the pad
28. Build it yourself: undo