Stillgrid

What it does

Stillgrid is a modern, minimalist sudoku platform that offers a calm, distraction-free puzzle experience. It supports multiple grid sizes (6×6, 9×9, 16×16) and several variants: Classic, X-Sudoku, Jigsaw, and Killer sudoku. Difficulty levels range from Easy to Medium to Nightmare, and puzzles are technique-graded to match all skill levels. The app includes a timer, mistake counter, notes mode for pencil marks, undo/redo, and auto-fill. It generates puzzles on the fly (e.g., "generated in 110 ms") and provides a solution view. Stillgrid is free, open source (MIT), and has no ads.

Who it is for

Stillgrid is designed for puzzle enthusiasts who enjoy sudoku and want a clean, accessible way to play on mobile devices or the web. It caters to both casual players (with Easy and Medium difficulties) and hardcore solvers (Nightmare difficulty, 16×16 grids, Killer variant). The calm, ad-free environment makes it suitable for focused, relaxing play without distractions.

Why it matters

Sudoku apps often clutter the experience with ads, timers, or competitive features. Stillgrid differentiates by emphasizing calmness and simplicity while still offering depth through variants and large grids. Its open-source nature (MIT license) allows community contributions and transparency. The daily challenges provide a reason to return, and the technique-graded difficulty helps players improve systematically. For those seeking a no-frills, variant-rich sudoku app, Stillgrid fills a gap.

Launch signal

Stillgrid is live and functional at stillgrid.app. It has been listed on Uneed.best with 37 upvotes, indicating early traction. The app is free and open source, with no monetization or funding mentioned in available sources. The website includes a feedback widget (powered by FeedLetter.co), suggesting the developer is actively gathering user input.

Brand and naming

The name "Stillgrid" combines "still" (calm) with "grid" (sudoku board), directly reflecting the tagline's promise of calm sudoku. The domain is exact and memorable, though the name may be confused with "still grid" as a generic term. Positioning is clear: a relaxing, variant-rich sudoku app with daily challenges, differentiating from competitive or timed sudoku apps.