About sotjun.com
Free puzzle games and beginner guides — playable in any browser, no installation needed.
Why This Site Exists
sotjun.com was built to make classic brain games instantly accessible — no app download, no account required. Sudoku and Gomoku are two of the most beloved puzzle and strategy games in the world, with histories stretching back decades. Yet many sites that offer these games provide only the game itself, leaving beginners to hunt for rules and strategies elsewhere.
sotjun.com combines the games with clear, beginner-friendly guides on the same site. You can read the rules, understand the strategies, and jump straight into a game — all without leaving the page.
Games
Sudoku
A logic puzzle played on a 9×9 grid. Fill every cell with a digit from 1 to 9 so that no digit repeats in any row, column, or 3×3 box. sotjun.com offers four difficulty levels (Easy, Medium, Hard, Expert), a daily challenge with a fresh puzzle every day, and a global top-10 leaderboard. A built-in memo mode lets you track candidate digits in each cell, making harder difficulties much more manageable.
Gomoku
A strategy board game where two players alternate placing stones, racing to connect five in a row. Play against an AI opponent to practice attack patterns, defense timing, and reading ahead. The game is easy to learn but rewards strategic thinking, making it enjoyable for both newcomers and experienced players.
Guides and Resources
Each game is supported by a set of written guides covering rules, how to play, and strategy tips. All guides are available in both English and Korean.
How the Site Is Run
sotjun.com is an independently operated site run by a single developer. All games are free to play. The site is supported by advertising revenue through Google AdSense, which covers server and operating costs. Feedback, bug reports, and suggestions are always welcome via the Contact page.