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Sudoku Blox is a fresh take on the world's most popular number puzzle. Instead of filling in one number at a time, you drag and drop pre-shaped block pieces onto a 9×9 Sudoku grid. Each piece carries a group of numbers that must fit perfectly into the board so that every row, column, and 3×3 box contains the digits 1 through 9 — just like classic Sudoku, but with an added layer of spatial reasoning.
A brand-new puzzle is released every day at midnight, giving you a fresh challenge to look forward to each morning. Gray pieces are pre-filled hints that are already locked in place, while the remaining pieces can be freely dragged, repositioned, and even pulled back off the board if you change your mind. With built-in undo and redo, there's no penalty for experimenting.
Playing Sudoku Blox is simple to learn but satisfying to master. Start by examining the pre-placed gray pieces on the board — these locked hints narrow down where the remaining pieces can go. Then drag the movable pieces from around the board onto the grid. Each piece snaps into place when you release it over a valid position. If a piece causes a conflict (a duplicate number in a row, column, or box), the conflicting cells turn red so you can spot mistakes immediately. You can click and drag any placed piece to move it to a new position, or drag it off the board entirely. Use the undo and redo buttons (or keyboard shortcuts Ctrl+Z and Ctrl+Y) to step through your moves. The puzzle is complete when every cell is filled with no conflicts.
Sudoku Blox appeals to both Sudoku veterans and newcomers. Veterans appreciate the twist — block placement adds a tangible, tactile dimension to the logical deduction they already enjoy. Newcomers find that working with pre-grouped numbers makes the puzzle more approachable than staring at 81 empty cells. The daily format keeps the habit loop going: one puzzle per day, just enough to sharpen your mind without overwhelming your schedule. Whether you play on your morning commute, during a lunch break, or before bed, Sudoku Blox fits naturally into your routine.
Yes — Sudoku Blox is completely free to play online right here at puzzlefind.com. No sign-up required, no ads blocking the board. The game is also available as a free download on the Apple App Store and Google Play Store.
In traditional Sudoku you fill in one number at a time. In Sudoku Blox, numbers come grouped into block-shaped pieces — think Tetris meets Sudoku. You drag entire pieces onto the board, which means you need to think about both the numbers and the shapes at the same time.
A new puzzle goes live every day at midnight. There are 365 unique puzzles that cycle throughout the year, so you'll always have a fresh challenge waiting for you.
Absolutely. Sudoku Blox works in any modern mobile browser — just visit this page and start dragging pieces. For the best mobile experience, you can also download the dedicated app from the App Store or Google Play.
White cells are numbers you've placed. Gray cells are pre-filled hints that cannot be moved. Red cells indicate a conflict — a duplicate number in the same row, column, or 3×3 box. Conflicts only appear once the entire board is filled, helping you spot exactly where the mistake is.
Yes. Use the Undo button below the board or press Ctrl+Z (Cmd+Z on Mac) to step back through your moves. Redo is available with Ctrl+Y (Cmd+Y on Mac). You can also drag any placed piece off the board to reposition it.
There's no time limit — take as long as you need. However, a timer tracks how fast you solve the puzzle so you can submit your time to the daily ranking and compete with other players around the world.
When you complete the daily puzzle, you can submit your completion time to the global leaderboard. Rankings reset every day when a new puzzle is released at midnight. You can only submit your score once per day (on your first completion) to keep the competition fair.