Triangular 9-line tic‑tac‑toe variant
Play an equitable twist on tic‑tac‑toe on a prism/triangular board made of nine rings arranged across nine straight lines, aiming to connect three of your color in a line.
Simple tap-to-place gameplay
Just tap an empty ring to place your ball; after each move, the opponent’s balls appear automatically, keeping the game fast and easy to pick up.
Fairer, more strategic configuration
Inspired by Thomas H. O’Beirne’s research on nine-row models, Trihex uses the rare configuration where the first player can’t “easily win,” making matches more balanced and strategic.
Reviews about Trihex
Discover our users' feelings and comments.
I've been using Trihex for a while, and it’s amazing! The design is intuitive, and the features work seamlessly.
User 1
2026年07月24日
I can't get enough of Trihex! It’s fun and engaging. It’s worth every download!
User 2
2026年07月13日
Trihex has greatly enhanced my experience. The performance is top-notch. Five stars from me!
User 3
2026年06月29日
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FAQs about Trihex
Browse the most frequently asked questions that you may interested in.
What is Trihex?
Trihex is an equitable version of tic-tac-toe played on a triangular field with nine lines. The goal is to occupy three rings of your color in a straight line.
How do you play Trihex?
You tap the spot on the prism-shaped board where you want to place your ball. After each of your moves, your opponent’s balls appear automatically. You win by connecting three of your pieces in the same straight line while preventing your opponent from doing the same.
What does the board look like at the start of a game?
At the start, the triangular Trihex board appears empty, with four pieces on each side. The lighter pieces are yours and the darker pieces are your opponent’s.
Why is Trihex described as an “equitable” tic-tac-toe variant?
Thomas H. O’Beirne experimented with topologically distinct nine-row models and found that in regular configurations the starting player can easily win; the configuration used for Trihex is noted as the exception, making the game more balanced.
What Android versions are supported?
Trihex is listed as compatible with Android 5.1+ (Lollipop).
How big is the Trihex app download?
Trihex is listed at about 5 MB in size (varies by version/source).
How do I install Trihex from an APK (manual install)?
Download the APK file, locate it in your notification bar or Downloads folder, tap it, then follow the prompts to install. (You may need to allow installation from unknown sources depending on your device settings.)
What should I do if I see “Not enough storage space” when installing?
Free up storage by removing apps or files you don’t need. If you downloaded the installer in a browser, the APK/XAPK file remains on your device during installation, so you may need at least twice the installer’s file size available.
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