6 Free Number Puzzles to Play Online
Number puzzles are one of the best ways to keep your mind sharp. Best of all, most of them are available to play for free in your browser. Here are 6 of the best number puzzles you can play online right now.
1. Sudoku
The world's most popular number puzzle. Fill a 9×9 grid so that each row, column, and 3×3 box contains digits 1-9 exactly once. Simple rules, endless depth. At Sudoku Dojo, play 6 difficulty levels free with built-in hints.
2. Killer Sudoku
A sudoku variant that adds "cages" — each cage has a sum clue, and digits within a cage must add up to that number. Adds arithmetic to the logical deduction of regular Sudoku.
3. Kakuro
A crossword-meets-sudoku puzzle. Fill cells with digits 1-9 so that the sum of each horizontal and vertical run matches the clue. A great next step from Sudoku.
4. KenKen
Combines Sudoku structure with arithmetic operations. Each cage's digits must produce the target number using the specified operation (+, -, ×, ÷). Tests both calculation and logic.
5. Mini Sudoku (4×4 & 6×6)
Smaller Sudoku grids perfect for beginners and kids. Quick to solve, great for short brain training sessions. Available on this site for free.
6. Futoshiki
A logic puzzle with inequality constraints. Use greater-than and less-than signs as clues to place digits. A unique twist on number placement puzzles.
Start with classic Sudoku — it's free and fun!
Play Sudoku Free