About Sudoku Vault

Sudoku Vault is a logic-based puzzle game featuring 4x4, 6x6, and 9x9 boards — each with four difficulty levels: Basic, Normal, Hard, and Expert. Whether youre a beginner or an expert, every grid offers a fresh challenge for your mind. Use smart NOTES to keep track of possibilities, and when you want to check your progress, tap the CHECK button — it will remove incorrect inputs and lock the correct ones, helping you stay focused on the solution. With clean design and intuitive controls, Sudoku Vault is the perfect blend of relaxation and brain training.

How to play

In Sudoku Vault you choose between 4x4, 6x6 and 9x9 boards at different difficulty levels, then fill each grid so that numbers do not repeat in any row, column or region. Tap a cell and enter a digit that fits the Sudoku rules, using the NOTES feature to mark possibilities. When you tap CHECK, the game highlights mistakes and locks in correct numbers so you can focus on solving the remaining cells.

Tips and tricks

Start with the smallest boards or easier difficulties to warm up, then gradually move to harder Sudoku Vault challenges as you improve. Use NOTES to track which digits are allowed in each cell and regularly clean up notes when rows, columns or regions become more constrained. Checking your progress occasionally can help you catch small mistakes early before they spread across the grid.

Why this game works well at school or work

Sudoku Vault lets you pick exactly how long and how hard a puzzle you want, which is perfect for fitting a quick logic workout into a break at school or work. Because you can play Sudoku Vault unblocked in a browser on laptops and Chromebooks, it is easy to continue a game whenever you have a spare moment. The clean design and focused gameplay provide quiet brain training without distracting sound or flashy effects.