Sudoku expert difficulty โ„–110 58 empty cells Expert

Sudoku expert difficulty โ„–110

~40โ€“60 min
Sudoku high difficulty โ„–110 52 empty cells Hard

Sudoku high difficulty โ„–110

~25โ€“40 min
Medium Sudoku โ„–102 45 empty cells Medium

Medium Sudoku โ„–102

~15โ€“25 min
Sudoku easy difficulty โ„–94 35 empty cells Easy

Sudoku easy difficulty โ„–94

~5โ€“10 min
Sudoku expert difficulty โ„–109 58 empty cells Expert

Sudoku expert difficulty โ„–109

~40โ€“60 min
Killer sudoku โ„–5 50 empty cells Killer

Killer sudoku โ„–5

~35โ€“55 min
Ddiagonal sudoku โ„–7 48 empty cells Diagonal

Ddiagonal sudoku โ„–7

~20โ€“35 min
Odd-Even sudoku โ„–6 45 empty cells Odd-Even

Odd-Even sudoku โ„–6

~15โ€“25 min
Sudoku expert difficulty โ„–108 58 empty cells Expert

Sudoku expert difficulty โ„–108

~40โ€“60 min
Sudoku high difficulty โ„–110 52 empty cells Hard

Sudoku high difficulty โ„–110

~25โ€“40 min
Medium Sudoku โ„–101 45 empty cells Medium

Medium Sudoku โ„–101

~15โ€“25 min
Sudoku easy difficulty โ„–93 35 empty cells Easy

Sudoku easy difficulty โ„–93

~5โ€“10 min
Odd-Even sudoku โ„–5 45 empty cells Odd-Even

Odd-Even sudoku โ„–5

~15โ€“25 min
Ddiagonal sudoku โ„–6 48 empty cells Diagonal

Ddiagonal sudoku โ„–6

~20โ€“35 min
Killer sudoku โ„–4 50 empty cells Killer

Killer sudoku โ„–4

~35โ€“55 min
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Sudoku for Every Skill Level: 4 Free Modes, No Sign-Up

Sudoku is a logic puzzle played on a 9ร—9 grid divided into nine 3ร—3 blocks. The goal is to fill every cell with digits from 1 to 9 so that each digit appears exactly once in every row, every column, and every block. Unlike crossword puzzles, sudoku requires no vocabulary or general knowledge - only logic - making it equally enjoyable for children and adults. You can play sudoku online free at 4 difficulty levels: the puzzle loads directly in your browser with no app download or registration needed. Click any empty cell and enter a digit from your keyboard or the panel below the grid. The system automatically highlights conflicting digits when you make a mistake, and your progress is saved automatically - close the tab and come back later without losing anything. Return daily for new sudoku puzzles: the database is updated regularly across all levels. Beginners should look for cells where only one digit is possible (a "naked single") - this is the simplest and most reliable solving technique. A more advanced method is the "hidden pair": if only two cells in a row or block can contain either of two specific digits, those digits can be eliminated from all other cells in that unit. For hard and expert sudoku, use the "box-line reduction" technique: if a digit in a block can only appear in one row or column, eliminate it from the rest of that row or column outside the block. To make sudoku engaging for every skill level, puzzles on crossword.by are split into 4 difficulty levels defined by the number of empty cells and the techniques required: Easy - 35 empty cells, ideal for beginners and warm-ups. Medium - 45 empty cells, a balance of logic and speed. Hard - 52 empty cells, for players who have mastered the basics. Expert - 58 empty cells, a serious challenge for experienced solvers. Start at the level that matches your experience and move up as you solve puzzles faster and with more confidence - you will gradually master every technique, from simple elimination to advanced logical chains.