SUDOKU PUZZLES
Free Sudoku Online - All Sizes & Variants: 9x9, 6x6, 4x4, Killer, Arrow, XV, Kropki
Play Sudoku online free at iQiQGame — no download, no sign-up. Choose classic 6x6, quick 4x4 or beginner 4x4 grids, or try variant types like Killer, Arrow, Kropki, Diagonal, Irregular (Jigsaw), Palindrome and XV. Every puzzle includes multiple difficulty levels, smart hints and instant checking, so beginners and experts can both train logic and number skills.
6x6 Sudoku Online Free - Quick Logic Number Puzzle Game
4x4 Sudoku Online Free - Beginner Number Puzzle Game for Kids
Play Arrow Sudoku Online Free - Sum-Based Number Puzzle Game
Play Diagonal Sudoku (X Sudoku) Online Free - Daily Logic Puzzle
Play Irregular Sudoku (Jigsaw Sudoku) Online Free - Daily Logic Puzzle
Play Killer Sudoku Online Free - Daily Cage Sum Puzzle
Play Kropki Sudoku Online Free - Daily Dots Puzzle
Play Palindrome Sudoku Online Free - Mirror Line Logic Puzzle
XV Sudoku Online Free - Play X & V Sum Clues Sudoku Puzzle Game
XV Sudoku 6x6 Online Free - Play X & V Clues Mini Sudoku Puzzle Game
9*9 SudokuOnline Free - Daily Logic Number Puzzle Game
What Is Sudoku?
Sudoku is a number-placement puzzle: fill the grid so that every row, every column and every box contains each digit exactly once. Sudoku needs no arithmetic — only logic. The variants in this section keep that core rule and add one extra constraint layer, such as cage sums, dot ratios, arrow paths or palindrome lines.
Why Play Sudoku on iqiqgame.com?
- Pure logic, zero luck. Every properly designed sudoku is solvable by deduction alone, so your improvement is measurable.
- One core, many twists. Master the classic grid once and the variants teach you a new constraint layer each time.
- Built-in helpers. Hints and a timer are included on every variant, from the 4x4 beginner grid to the full 9x9.
- Progressive difficulty. Start at 4x4 in minutes and work up to variants that challenge experienced solvers.
How to Play Sudoku on iqiqgame.com
- Choose a variant from the index below — start with the classic 9x9 or a smaller grid if you are new.
- Open the puzzle page and read its variant rule: the base rule plus one extra constraint explained with examples.
- Fill the grid using scanning, candidate elimination and the variant-specific technique described on the page.
- Stuck? Use the Hint, or open the matching solver on the Solvers page to check the next logical move.
Sudoku FAQ
Are all sudoku variants free to play?
Yes. Every sudoku variant on this page runs in your browser and is free with no sign-up required.
Which sudoku variant should I start with?
If you are new, start with 4x4 or 6x6 to learn the core rule. If you already know the classic, try Killer, Kropki or XV for a new constraint layer.
Do I need to guess to solve these puzzles?
No. Well-designed sudoku puzzles are fully logical — the game pages explain the scanning and elimination techniques that replace guessing.
Is this page different from the individual sudoku pages?
Yes. This page is the index of all variants; each variant page has its own full rules, technique guide and FAQ.
New sudoku variants are added to this index as they launch on iqiqgame.com.