The Hamiltonian Circuit

The Hamiltonian Circuit

A challenging puzzle game

33 ratings
27 reviews
Free
In-App PurchasesWith Ads

Details

  • Released
  • Updated
  • January 22, 2021
  • June 3, 2026
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About

This challenging puzzle game requires you to find a continuous circuit that visits every square on a grid without crossing itself or walls. Progress from simple grids to complex, large-scale challenges that test your abstract thinking and problem-solving skills. Hints are available to guide you when you get stuck.

Visit every square on the grid
Avoid walls and self-crossing
Progressive grid sizes (4x4 to 20x20)
Hint system for assistance
Automatic progress saving
Single solution per puzzle
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What's New in The Hamiltonian Circuit

3.4.8

June 3, 2026

Routine platform and frameworks update

13

In-App Purchases

$0.99

Pack of 50 Hints

50 hints: find errors or extend longest path

User reviews

Good puzzles!

Started playing this after seeing the developer n Jeopardy. The puzzles is great, and reminiscent of other circuit completion puzzles like Nikoli Slitherlink, and Kaser’s Willa’s Walk.

So why four stars?

The app itself feels like a minimum-viable product and could use a little more work. In particular, the lack of an undo/redo button is not great. I find myself having to hit reset if I paint myself into a corner and would prefer to tap undo a few times.

Also when you start the app up, you have to do some menu diving to get to your last puzzle. This shouldn’t require more than a single tap.
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Response from developer

Great suggestions! We used to have undo/redo, but replaced it with pencil mode. I will seriously consider putting it back in. The comment about menu diving is right on the money, and I will definitely implement it. Glad you saw me on Jeopardy! Especially glad you shared your suggestions.

Fun Game

Would be 5 stars, but I can't seem to go back and re-play completed puzzles? I love the minimal interface.

Response from developer

Good suggestion. I didn't think people would want to replay completed puzzles, but of course it makes sense.

Gute Rätsel, wirkt aber noch unfertig

Rätsel sind gut.

Aber obwohl ich „Musik aus“ eingestellt habe, beginnt die Musik nach einem fertigen Rätsel wieder zu spielen und unterbricht das Hörbuch, dass ich hören will.

Response from developer

Danke für den Bericht. Entschuldigung für meine langsame Antwort. Ich habe das Problem behoben. David

Addicting game

Just downloaded this today and am already addicted!

Response from developer

Thanks for the feedback! Let us know if you have any suggestions for improvements.

Good game, but…

A good, challenging puzzle game. But there’s no reason for it to run as hot or burn through my battery like it does. So what’s it doing in the background?

Response from developer

Thanks for the feedback. We use profiling tools to measure energy consumption, as well as using the app on a variety of devices, and we haven't ever seen this behavior. If you get a chance, please send some additional information to info@goodthinkinggames.com. Let us know what device and model you're using, what version of iOS, and whether you notice the problem particularly when a particular screen is visible. Best, David

FAQ

What is the goal of The Hamiltonian Circuit?

The goal is to find a single, continuous path that visits every square on the grid exactly once, without crossing itself or passing through any walls. This creates a complete circuit.

How does the hint system work?

If you get stuck, you can press the 'Hints' button. Mistakes you've made will turn red and then disappear, helping you identify errors. If you are on the right path, a line will be added to guide you.

Is there a cost to play?

The application is free to download and play, but it does include in-app purchases and advertisements. Specific details on pricing for in-app purchases are not provided in the description.

What kind of puzzles are available?

Puzzles start with simple 4x4 grids and increase in difficulty all the way up to very challenging 20x20 grids. Each puzzle has only one unique solution, and larger puzzles can take hours to solve.

Can I save my progress on difficult puzzles?

Yes, your progress is automatically saved. This means you can quit in the middle of a challenging puzzle and return to it later without losing your work.