Skip to content

Learn the rules of 4x4 Sudoku

One thing to notice as you play

Choose one rule to keep in mind for this round. Apply it consistently rather than guessing what another version might allow. Use the example to check your reasoning.

Your objective

Fill all cells with 1–4; do not repeat a symbol in any row, column or region. An attractive position is not enough unless the goal is met. Start with a deliberate move.

Work through the instructions

  1. Select an empty cell. The original clues cannot be edited.
  2. Choose a symbol from the number pad, or type it on a keyboard.
  3. Turn Notes on to record candidate symbols without committing an answer.
  4. Use Check entries to check your filled values. Hint reveals one value from the verified solution.
  5. Complete the board, or choose New puzzle for another board.

How your actions work

Tap or click a cell and use the number pad. Keyboard: arrows select cells; digits (and A–G on 16×16) enter values; Backspace erases. Use the control method described here for this activity. Avoid pressing the same control repeatedly while a move is being processed.

Learn from a sample situation

On one puzzle in this collection, row 1, column 1 has 3 in its solution. Read the clues on your current board before using that value; another puzzle can need a different entry. Your next round may have a different position, so inspect it before acting. Keep the controls nearby.

Keep this in mind

Notes are reminders, not final entries. A full board only counts as complete when it satisfies every rule. Read the feedback to see why an action did not have the expected result. Choose one rule to keep in mind for this round. Apply it consistently rather than guessing what another version might allow.

If you are unsure

What is the goal of 4x4 Sudoku?

Here is the relevant explanation: Fill all cells with 1–4; do not repeat a symbol in any row, column or region.

For my first round, how do I control 4x4 Sudoku?

Keep this in mind: Tap or click a cell and use the number pad. Keyboard: arrows select cells; digits (and A–G on 16×16) enter values; Backspace erases.

While reading the Guide, what example helps explain 4x4 Sudoku?

Keep this in mind: On one puzzle in this collection, row 1, column 1 has 4 in its solution. Read the clues on your current board before using that value; another puzzle can need a different entry.

For my first round, what should I watch out for in 4x4 Sudoku?

Keep this in mind: Notes are reminders, not final entries. A full board only counts as complete when it satisfies every rule.

For my first round, what format does 4x4 Sudoku offer?

Keep this in mind: Play using the solo mode shown on this page. Read the controls before starting a new round.

For my first round, which play mode does 4x4 Sudoku use?

Here is the relevant explanation: The mode on this page is Solo. Same-device play uses one screen; this game library does not provide internet matchmaking.

For my first round, where should I start with 4x4 Sudoku?

Here is the relevant explanation: Select an empty cell. The original clues cannot be edited.

When I return, do I need an account or a payment for 4x4 Sudoku?

Keep this in mind: No player account or payment is needed. Game scores are recreational results, not cash prizes.

When I return, how can I find 4x4 Sudoku again?

Use the Games list or save this game page in your browser bookmarks. The Guide is linked from the playing page.

For my first round, how do I report an issue with 4x4 Sudoku?

Keep this in mind: Use the contact form and include the game name, browser, device and the actions that led to the issue. Do not send passwords or payment details.