Quickstart

1. Choose a Difficulty

From the home page, select your difficulty level:

  • Easy — Great for beginners, ~35 clues
  • Medium — A bit more challenge
  • Hard — Requires techniques beyond scanning
  • Expert — For experienced solvers
  • Master — Near the limit of comfortable solving
  • Evil — The ultimate test

Not sure? Start with Easy to learn the interface.

2. Start Solving

Select a cell — Click any empty cell to select it. It highlights along with its row, column, and box.

Enter a number — Press 1-9 on your keyboard or tap the number pad below the grid.

Use notes — Press N to toggle notes mode. Enter multiple candidates in a cell when you're unsure.

Undo mistakes — Press Ctrl+Z or tap the undo button. You can undo as many times as needed.

3. Complete the Puzzle

Fill every cell so that:

  • Each row contains 1-9
  • Each column contains 1-9
  • Each 3×3 box contains 1-9

When you've correctly filled the entire grid, you win!

Quick Tips

  • Blue numbers are your entries; dark numbers are given clues
  • Red numbers indicate conflicts — check your work
  • The timer tracks your solve time (hide it in settings if you prefer)
  • Keyboard navigation — Arrow keys move between cells

Next Steps