Steam Playtests
Great Circle

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Great Circle playtest

by Matt Walton Games

A multiplayer momentum sport played in a world that curves back on itself. Match the ball's momentum to catch it, curve shots the long way around to score, and compete 1v1 to 4v4 — in VR or on your monitor, with cross-play between them.

Anyone with a Steam account can join, and it's free.

Access
Instant
On playtest since
Nov 12, 2026
Planned release
To be announced
Developer
Matt Walton Games
Platforms
Windows
Players
Cross-platform, Multiplayer, Online PvP, PvP, Single-player
Languages
English

How to join the Great Circle playtest

  1. Open the game's Steam page with the Join playtest button. Sign in to Steam if it asks.
  2. Use the Great Circle playtest signup there. You're in straight away, with nothing to pay.
  3. The playtest shows up in your Steam library, ready to install and play.

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How AI is used

Great Circle's code was written with the help of an AI programming assistant, and some store-page and marketing text was AI-drafted. Its art and audio are generated procedurally in-engine, not by AI models, and no generative AI runs during gameplay.

The developer's own words, from Steam.

About Great Circle

Great Circle is a momentum sport played inside a world that curves back on itself. Fly, catch, and score across a closed sphere where every straight line is a great circle — and the long way around is a scoring lane.

Part zero-gravity ball game, part non-Euclidean playground: match the ball's momentum to catch it, read its arc across the curved world, and bend shots the long way around to score from behind your opponent. Easy to pick up, deep to master, and unlike anything you've flown.

Score the long way around

In a closed, spherical arena there are no walls and no out of bounds. Every path loops all the way around and returns to where it started — so you can fire the ball away from the goal and watch it curve around the world into the net. Learning to think in curves is the whole game.

A sport built on momentum

You don't stop and grab the ball — you match its momentum to catch it, cut it off mid-flight, and fling it toward the goal. Pure physics, no twitch aim. Mastery is reading curves, not out-clicking people.

Team play, 1v1 to 4v4

  • Real passing, give-and-gos, steals, and interceptions
  • Public matchmaking, or private games by join code
  • Solo practice against AI opponents at four difficulty levels
  • Pick your ship and pick your side

Flatscreen or VR — with cross-play between them

Play on a monitor with mouse, keyboard, or controller, or step into the arena in VR. Flatscreen and headset players share the same matches, so you can always play with your friends — whatever they're on.

Always a game to jump into

A quick tutorial, comfort options for VR, and bots that fill empty seats mean the arena's never empty while you learn to fly.

Learn to fly a world that bends. See you on the great circle.

From the game's Steam page.