Hi Product Hunt! 👋

I built SudoLoom (https://sudoloom.com) because I love playing Sudoku every morning, but I was tired of existing Sudoku sites that drain battery with flashing banner ads, laggy trackers, and "hints" that just blindly fill in a number without telling you WHY.

Here is what makes SudoLoom different:

🧠 1. Human-Logic Smart Hints (Sudoku Learning)

Instead of just revealing the answer, SudoLoom’s solver analyzes the board using real human techniques—from Naked & Hidden Singles to Naked/Hidden Pairs, Pointing Pairs, X-Wing, and XY-Wing—highlighting the exact related cells and explaining the step-by-step deduction.

✅ 2. 100% Unique Solutions & True Difficulty Grading

Every board is verified by a fast Bitmask + MRV backtracking engine to guarantee a single unique solution, and graded by the actual human techniques required to solve it (not just by counting empty cells).

🌍 3. Global Daily Sudoku + Wordle-Style Emoji Sharing

Every day features a deterministic global puzzle (generated from the YYYY-MM-DD seed) so everyone in the world plays the exact same board—with zero backend or account sign-up needed.

🖨️ 4. Built-in A4 Printable PDF Generator (/printable-sudoku)

Prefer solving with a real pencil on paper? Generate crisp A4 PDF sheets with 1, 2, or 4 puzzles per page and optional answer keys in one click.

🎨 5. Calm "Nordic Warm Paper" UI & Multi-Language

Designed for zero eye strain on both mobile (fits within 100dvh with no accidental scrolling) and desktop (full keyboard support: Arrow keys / WASD, 1–9, N for Notes, Ctrl+Z for Undo). Automatically supports English, Vietnamese, Japanese, Korean, and Spanish.

It's 100% free and requires no login. I'd love for you to try today's puzzle and let me know what you think! 🧩✨