Sudoku.by
Home
Classic
Killer
Daily
--:--:--
Competition
Leaderboard
Rules
Blog
Sudoku Variants
Extra Regions
Diagonal Sudoku
Hyper / Windoku
Samurai Sudoku
Jigsaw Sudoku
Irregular Diagonal
Line Constraints
Thermo Sudoku
Arrow Sudoku
Renban Sudoku
German Whispers
Palindrome Sudoku
Between Lines
Grid Variants
Mini Sudoku (4×4)
Cube / 3D Sudoku
Alphabet Sudoku
Outside Clues
Little Killer Sudoku
Sandwich Sudoku
Skyscraper Sudoku
Outside Sudoku
Cell Relationships
Kropki Sudoku
XV Sudoku
Consecutive Sudoku
Non-Consecutive Sudoku
Greater Than / Less Than
Odd / Even Sudoku
Anti-Constraints
Anti-King Sudoku
Anti-Knight Sudoku
Anti-Consecutive Sudoku
Special
Clone Sudoku
Chaos Construction
Sukaku
Sign In
Register
Home
Classic Sudoku
Easy
Medium
Hard
Expert
Evil
Master
Extreme
Killer Sudoku
Daily Challenge
Competition
Leaderboard
Rules
Blog
Sudoku Variants
Extra Regions
Diagonal Sudoku
Hyper / Windoku
Samurai Sudoku
Jigsaw Sudoku
Irregular Diagonal
Line Constraints
Thermo Sudoku
Arrow Sudoku
Renban Sudoku
German Whispers
Palindrome Sudoku
Between Lines
Grid Variants
Mini Sudoku (4×4)
Cube / 3D Sudoku
Alphabet Sudoku
Outside Clues
Little Killer
Sandwich Sudoku
Skyscraper Sudoku
Outside Sudoku
Cell Relationships
Kropki Sudoku
XV Sudoku
Consecutive
Non-Consecutive
Greater Than
Odd / Even
Anti-Constraints
Anti-King
Anti-Knight
Anti-Consecutive
Special
Clone Sudoku
Chaos Construction
Sukaku
View All Variants →
Sign In
Create Free Account
Home
›
Daily Challenges
›
October 21, 2026
Daily Challenge - October 21, 2026
Master
Play this archived daily challenge puzzle.
Play This Puzzle
Solvers
Best Time
8
18:47
← October 20, 2026
October 22, 2026 →
← Back to Daily Challenges