How to Play Sudoku in 2 Minutes

Sudoku is a 9x9 number puzzle. Fill every empty cell with a digit from 1 to 9 so that each row, each column and each 3x3 box contains every digit exactly once. You never need to guess: every good puzzle has one solution that logic can find. When the grid is full and nothing repeats, you win.

Transcript

1. Sudoku is a number puzzle on a nine by nine grid. Your goal is to fill every empty cell with a digit from one to nine.
2. Every row must contain the digits one to nine exactly once. No digit can appear twice in the same row.
3. The same goes for every column. Each digit one to nine appears once from top to bottom.
4. The thick lines split the grid into nine boxes of three by three. Each box must also hold every digit once.
5. Pick a cell and ask which digits are missing from its row, column and box. If only one fits, write it in.
6. When a cell has several options, write them as small pencil notes. Notes help you see singles and pairs later.
7. In Tidoku, a hint names the technique and shows why. It is a good way to learn, one step at a time.
8. Killer sudoku adds cages. The digits in each dashed cage must add up to the small number in its corner, with no repeats.
9. Play a new Daily Puzzle every day, or follow the Journey of six hundred levels that teaches one technique after another.
10. Play Tidoku free on Google Play. It works offline, so you can solve sudoku anywhere. iOS is coming soon.

• Read the full guide: How to play Sudoku
• Watch the Tidoku trailer
• More about Tidoku