Prime Sudoku is a free online sudoku puzzle game where your goal is to fill every cell of a 9×9 grid with numbers 1 through 9, making sure no number repeats in any row, column, or 3×3 box. It runs directly in your browser with zero downloads required, making it one of the most accessible number puzzle games around. Originally built for Jio feature phones, it keeps the interface clean and distraction-free so you can focus purely on solving.

The game offers multiple difficulty levels, so beginners can ease in with straightforward grids while experienced players can push their logic skills on harder configurations. The core loop is simple: scan rows, eliminate possibilities, and lock in numbers with confidence. If you get stuck, work the boxes first – finding a 3×3 section with only one or two missing numbers is usually the fastest way to break a deadlock. The minimalist design keeps load times fast and gameplay smooth even on modest hardware.

Prime Sudoku is a great pick for anyone who enjoys classic brain training games, daily puzzle challenges, or logic-based number games. Whether you're searching for free sudoku puzzles to play online, easy sudoku for beginners, or a hard sudoku challenge to sharpen your mind, this game covers all the bases. Fans of grid puzzles, math games, and offline-style casual games will feel right at home here. Play free, no sign-up needed.