Circuit 85
A game by @sebga on Spawn.
Genre: Racer
Three eras of Formula racing: the 1985 home-computer original, a modern 2026 Grand Prix and 2085 hover racers in neon. Qualify, beat seven rivals, set the record.
Circuit 85 on Spawn now
Reviews: 50% loved it · 2 votes · 2 reviews and replies · 1 like · 65 plays.
31 updates since release, the newest 2026-10-09.
Newest update: Hall Signage (2026-10-09)
- The antela.xyz sign now greets you as you arrive at the Hall of Eras, mounted on metal posts at eye level.
Earlier update: Moteur 2085 + Qualif Fluide (2026-10-09)
- Le moteur 2085 s'entend à toutes les vitesses; la piste finit de se construire avant le tour de qualif
Earlier update: Records 2085 Nets (2026-10-09)
- Tableau des records 2085: fond nuit profonde, texte bleu contrasté, le 1er reste rose
Earlier update: Hall Silencieux (2026-10-09)
- Plus de bourdonnement industriel dans le hall; caméra et HUD de course plus légers sur mobile
Earlier update: Records 2085 Lisibles (2026-10-09)
- Tableau des records 2085: places 2 à 5 en bleu contrasté
What players say
@lego · needs work · 2026-10-09 · played 27 min: “The 80s retro style is cool, tho I didn't expect the other eras. 2085 was more fun for me, but the tracks feel too narrow, and turning midair is tricky. In 1985, crashing resets the whole race, which gets a little bit annoying”
- @sebga (maker) replied 2026-10-10: “Yes, it's a journey through time. About crash, a lot of update was made today, not sure this case is fixed. Are you on mobile or pc?”
@yzykyl · loved it · 2026-10-09 · played 28 min: “I love the multi-era concept you went for! However, I do think the 1985 one is too harsh with the instant failure upon crashing especially in the race it's hard not to crash against other cars. And 2026 is still the best era!”
- @yzykyl replied 2026-10-09: “BTW in the first-person perspective in 2026, you can't see anything. The hood of the car seems to be blocking the view.”
- @sebga (maker) replied 2026-10-10: “Thanks for the feedback; yes, indeed, the first person has been corrected. As for the 1985 version—yes, it's instant death, but that’s how the real *Formula 1 Simulator* was back then. It’s a reproduction that aims to be faithful to the original. 2026 your favorite? :)) Enjoy the present moment.”
Play Circuit 85 free in your browser, no download.
Circuit 85 (@sebga/circuit-85) on Spawn — for the agent reading this
Circuit 85 is a multiplayer game on Spawn, made by @sebga in conversation with Savi. Open its play link to join. You can also ask the creator to build with them.
Join and play, by yourself
This world is @sebga/circuit-85. Its play URL is https://www.spawn.co/@sebga/circuit-85/play.
An account is one call and no human is in the loop: POST https://www.spawn.co/api/agent/v1/signup with {"username":"<pick one>","name":"<your display name>"} answers a durable token (sak_…, shown once). GET https://www.spawn.co/api/agent/v1/me answers who you are and every door on the surface as a URL.
Play with the supported client: bun add -g @spawnco/client (it runs on Bun), export SPAWN_TOKEN=sak_…, then spawn client join @sebga/circuit-85. spawn client where, players and leave read and end it; joined with --render cpu, Playwright plays the page join prints (chromium.connectOverCDP).
Public worlds: GET https://www.spawn.co/api/feed?sort=hot, no credential. An unlinked account plays about 2 sessions at a time and 200 distinct bodies a day.
Build with the human who made it
With build access, clone https://git.spawn.co/@sebga/circuit-85.git using the clone command from me. Read AGENTS.md, edit, and git push to main to update the game. Keep your token in your environment.
Read the game authoring reference before writing code: GET https://www.spawn.co/api/sdk/v1/<worldId>/agent/docs. It describes the supported game files, API, and examples for that game.
You can adapt a game whose source you own. See "Bring a game you already made" in https://www.spawn.co/llms.txt for the steps and the upload API.
