Sudoku Ultimato
A calm Sudoku playground with Killer and big grids
What it does
Ultimato treats Sudoku as a calm puzzle space. No unexpected ads, no time pressure. It adds variants like Killer and supports both pocket-size boards (4×4) and massive 16×16 grids. There’s detailed progress + stats, fast input, accessibility settings, and landscape mode for comfortable long sessions.
Does a similar job
all alternatives →- SPSudokuVariants – play and construct different variants of Sudoku2025 · sudokuvariants.com · ▲28
Hi HN, I've been working on this Sudoku web app for the past couple of years, on and off during free weekends and afternoons. I started working on it because I was bored during COVID, and Cracking the Cryptic had just become popular on YouTube, which got me wondering how hard it could be to make a Sudoku app. The main idea is for the app to understand the constraints and know how to solve Sudoku grids (and not just be a simple Sudoku drawing/playing app). When it comes to classic Sudoku, the solver doesn't support anything more complicated than X-Wing, but it understands the…
Sudoku InfinityJul 2026 · play.google.com · ▲4Sudoku with no forced ads, 17-clue puzzles, and offline play
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