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  1. Stillgrid

    stillgrid.app

    A modern, mobile-first sudoku site with variants, technique-graded difficulty, daily challenges, and no signup. Play Classic, X-Sudoku, Jigsaw, and Killer.

Practical guides

What Is the Killer Sudoku Calculator on Stillgrid?
The Killer Sudoku Calculator is a helper page on Stillgrid, a mobile-first sudoku site, for working out the number combinations that can fill a Kille…
How Stillgrid's Daily Sudoku Challenges and Archive Work
Stillgrid offers a daily sudoku challenge and a separate archive page for past daily puzzles, and you can play without signing up. The site is a mobi…
How Does Stillgrid Grade Sudoku Difficulty, and What Is Evil Sudoku?
Stillgrid grades difficulty by the solving techniques a puzzle requires, not by how many cells start empty. Its hardest tier is labeled "Evil Sudoku,…
Which Sudoku Variants Are Available on Stillgrid?
Stillgrid offers four sudoku variants: Classic, X-Sudoku, Jigsaw, and Killer. Each has its own rules page on the site, so you can read the rules befo…
What Is Stillgrid and What Kind of Sudoku Site Is It?
Stillgrid is a mobile-first sudoku website that offers Classic, X-Sudoku, Jigsaw, and Killer variants, with difficulty graded by solving technique, d…