A while ago, my partner bought a Klotski puzzle machine for our kid. Surprisingly, it became a family favorite — everyone, from the kid to the grandparents, kept taking turns playing it.

But the device only had 10 built-in levels. After a few days, we had solved them all. So I decided to make my own web version, expanding it to 44 unique layouts and making it accessible to anyone online.

That’s how Klotski.org was born — a browser-based puzzle platform focused on classic logic games, starting with Klotski.

Main features: 44 handcrafted levels, from beginner-friendly to extremely challenging. Tracks your moves and time, great for self-challenges or friendly competition. Works on both desktop and mobile, no installation required. Includes classic Huarong Dao, 15 Puzzle, and Number Klotski variations. Supported by ads to keep the platform running, without disrupting gameplay.

If you find some levels too hard, don’t worry — there’s also a built-in Klotski Solver that shows step-by-step optimal solutions. Still, I recommend trying to solve it yourself first — that “aha!” moment when you figure it out is the best part of the game.

How to play Move the red Cao Cao block (2×2) to the exit at the bottom center of the board (rows 4–5, columns 2–3) to win.

I’m sharing this here because I’d love to get feedback from the HN community: What do you think matters most for an online puzzle platform — level design, gameplay depth, or user experience? You can play it directly here: https://klotski.org/

Try a few levels and let me know which one stumped you the most, or what feature you’d like to see next.