Undersphere
A multiplayer shooter fought on the inside of a sphere, where gravity always pulls you toward the shell.
Official site www.playundersphere.com, verified Nov 3, 2026. Entry URL submitted by the entrant in the official Vibe Jam 2026 games data (as playundersphere.com, which redirects here) and named in the organizer's winners post; the game's credits list Noah Whiteson as Creator.
Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — official siteBrowserReleasedFree
Runs in a desktop browser. No download.
Browser (no download) · Official link verified Nov 3, 2026.
About Undersphere
A fast multiplayer first-person shooter set on the inside of a spherical world. Gravity pulls toward the shell, so the battlefield curves up and over your head, and a grenade thrown across the map follows the curve to the far side. Players run, fight and outmanoeuvre each other, earn coins to unlock gun skins and a skill tree of small upgrades, and can also play solo. It was made for the Cursor Vibe Jam 2026, whose rules required at least 90% of each game's code to be written by AI; in the official submission the developer, Noah Whiteson, lists Cursor as the tool, and the in-game credits name “Gemini & Claude” for AI development. It won the “Unique Concept” special award. Free in desktop browsers; the submission marks it as not built for mobile.
How it was built
VerifiedIn the official Vibe Jam 2026 submission the entrant lists Cursor as the tool and answers Yes to the AI-written field. The game's own credits screen lists “Gemini & Claude” under “AI Development” and does not mention Cursor; whether these were the models used inside Cursor is not stated. 3D models are credited to Kenney and sound effects and music to Pixabay, so the assets were not AI-made.
- OfficialJam rule 3: at least 90% of the code has to be written by AI. — Vibe Jam (Pieter Levels)
- DeveloperIn-game credits: “Gemini & Claude” for AI development, “Vite & Three.js” as the engine. — Noah Whiteson
Built for the Cursor Vibe Jam 2026 with Vite and Three.js. The code is AI-written per the jam submission; 3D models come from Kenney and audio from Pixabay, per the in-game credits.
- Engine / framework
- Three.js (with Vite)
- Languages
- Not disclosed
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“The fact that in this game you can throw a grenade to the other side of the map and it will stay within gravity and travel with the proper proportions.”Verification notes: Tool (Cursor), engine, genre, pitch, inspiration and the multiplayer and mobile flags from the entrant's answers in the official Vibe Jam 2026 games data (submitted 29 Apr 2026; final rank 14 of 945 entries); rule 3 on the jam page requires at least 90% AI-written code. Award from the official data and the organizer's winners post of 17 Jun 2026, which credits “Undersphere by @_NoahWhiteson”. Developer name and location from the X profile @_NoahWhiteson (display name Noah Whiteson, location Toronto, Ontario) and the in-game credits, which list Noah Whiteson as Creator and David Whiteson as “Assistant to the Creator”; team size is not stated, so it is not recorded. The credits also list Gemini & Claude (AI development), Kenney (3D models) and Pixabay (sound and music). The game's code only talks to its own game and account server; no calls to AI services were found. The page's og:url points to undersphere.com, which showed only a parked redirect on 3 Nov 2026. The jam page's widget counter showed 1,264 plays for playundersphere.com on 3 Nov 2026 (observed; plays are sessions, not players or downloads, so not recorded as a metric). The release date is not stated; the jam submission is dated 29 Apr 2026.
Development history
Entered in the Cursor Vibe Jam 2026 (submission date in the official games data); the jam required at least 90% AI-written code.
Wins the “Unique Concept” special award, one of 12 special prizes the jam page lists at $1,000 each; final rank 14 in the official games data.
Game performance
Each figure measures something different — concurrent players, owners, downloads and sales are never interchangeable and are never added together. Labels show where each number comes from.
Browser (official site)
Free. Gun skins and upgrades are bought with coins earned in the game; no real-money purchase was found in the game's code.
No public metrics recorded for this listing.
Not publicly available: Concurrent players (site), Monthly revenue, Gross revenue.
Sales & revenue (all platforms)
Browser game — there are no downloads to count.
Reviews & rankings
Not yet reviewed by our editors.
Prototype: your vote is kept only in this browser and is not counted anywhere.
Not currently ranked.
No player reviews yet.
Prototype: reviews are stored in your browser only and are not published or sent to a server. Reviews are shown in the language they were written in.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| Cursor Vibe Jam 2026 — rules, prizes and game stats Vibe Jam (Pieter Levels) | Official site | Not confirmed | Nov 3, 2026 |
| Vibe Jam 2026 games data (entrant submissions, final rank, awards) Vibe Jam | Official site | Not confirmed | Nov 3, 2026 |
| Vibe Jam 2026 winners and how the games are getting close to real production quality levels.io (Pieter Levels, organizer) | Official site | Jun 17, 2026 | Nov 3, 2026 |
| Undersphere — Fight The Sphere (game page and in-game credits) Noah Whiteson | Official site | Not confirmed | Nov 3, 2026 |
| Noah Whiteson (@_NoahWhiteson) — X profile X | Social post | Not confirmed | Nov 3, 2026 |
| Official game page (language check) Noah Whiteson | Official site | Not confirmed | Nov 3, 2026 |
