SuDuel
–
New Game
Mode Standard Versus Difficulty Easy Medium Hard Expert
Turn Timer None 30s 60s 2m
Variants Optional — leave empty for standard sudoku.
Killer Cages
Thermometers
German Whispers
Diagonal (X-Sudoku)
Arrows
Renban Lines
Palindrome Lines
Kropki Dots
Anti-Knight
Import Puzzle
Supports f-puzzles.com, sudokupad.app, and crackingthecryptic.com links.
Menu
Difficulty:
Mode:
Rules:

Standard sudoku rules apply.

Cipher grade:
Partial
Unsolvable
/ cells solved
Techniques:
Show conflicts Highlight same number Highlight row/col/box Show remaining count Auto-clean pencil marks Show timer Show hints Highlight solved cages Allow nudging
Auto-nudge
Min level
Max level
Techniques
Naked Single (10) Hidden Single (20) Naked Pairs (30) Pointing Pairs (40) Box/Line Reduction (45) Hidden Pairs (50) Naked Triples (55) Hidden Triples (60) Naked Quads (62) X-Wing (65) Skyscraper (68) Swordfish (70) XY-Wing (75) Simple Colouring (80) Unique Rectangles (85)
Appearance
Cage Helper
Sum: Cells:
Placed:
= left
Combinations
No valid combinations
Ruled out
Arrow Helper
Sum: Cells:
Waiting for opponent…
You
Opponent
Waiting for opponent… Starting soon…
Opponent disconnected Claiming win in s…
Game Forfeited You gave up the versus match.
You Win!
This counts as a forfeit. Your opponent will win the match. This will end the current game for all players.
Restart Puzzle?

This will clear all your progress on the current puzzle. Are you sure?