> ABOUT_

3-2-1 is a logic puzzle built around just three numbers.

Think some Sudokus are impossible? Try 3-2-1 on Expert difficulty with a 7×7 grid.

Fill every cell with a 1, 2 or 3 and use the clues around the grid to discover where each number belongs.

The rules are simple. The puzzles aren't always.

> HOW TO PLAY_

• Every cell contains a 1, 2 or 3.
• The same number cannot appear in two adjacent cells.
• Every row and column must contain at least one 1, one 2 and one 3.
• The clues around the grid tell you how much is left to reach the target sum for each row and column.
• Every puzzle has one unique solution.

That's all you need to know.

The game also includes optional tools such as possible combinations and pencil notes to help you solve harder puzzles.

> CLASSIC MODE_

Choose your grid size from 4×4 to 7×7 and play at four difficulty levels:

Easy · Medium · Hard · Expert

Take your time, avoid mistakes and try to beat your best times.

> RUSH MODE_

A completely different way to play 3-2-1.

You have 60 seconds to solve as many puzzles as possible.

Solve quickly to earn time bonuses and build combos. Make a mistake and the current puzzle is lost. Three mistakes end the run.

How far can you get?

> CONTROLS_

Mouse / Touch

• Select a cell and choose 1, 2 or 3.
• Use Pencil Mode to add or remove notes.

Keyboard

• 1 → Enter 1
• 2 → Enter 2
• 3 → Enter 3

Keyboard controls are especially useful in Rush Mode.

> FEATURES_

• Interactive tutorial
• 4 grid sizes
• 4 difficulty levels
• Classic and Rush modes
• Delta clues
• Possible-combination assistance
• Pencil notes
• Personal records and statistics
• English and Spanish
• Light and dark themes
• Mouse, keyboard and touch support
• Playable directly in your browser

No account. No installation. Just 1, 2 and 3.

> CREDITS_

Designed and created by José María Murillo
Published by JMU Games

© 2026 José María Murillo. All rights reserved.

A spectacular combination of Sudoku and Kakuro, but with simple rules. A fantastic game!