Bumper King
Free · play online in your browser, no download
Smash rival bumper cars, grab power-ups, dodge hazards and fight to wear the crown.
Official site bumper-king.vercel.app, verified Nov 3, 2026. The game's start-screen credits read “Created by Wellington for Vibe Jam 2026”, linking the entrant's X account xwerux (display name Wellington); also the entry URL in the official Vibe Jam 2026 games data.
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 or mobile browser. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About Bumper King
A 3D arcade bumper-car battle in the browser. You ram rival cars around an arena, pick up power-ups such as a speed boost, a shield, a magnet that blasts cars away and a mega power-up for stronger hits, and avoid hazards such as oil slicks and holes in the floor, while the leading car wears the crown. Matches run on an online multiplayer server, with computer-controlled bots in the arena alongside players. The entrant says the aim was a fast, chaotic arcade game that feels instantly fun, inspired by bumper cars and the growth-and-domination loop of Snake.io. The game's credits say the code was generated with the Codex agent using GPT-5.4, which also made the 2D icons, logo and textures, and that the music and sound effects were made with ElevenLabs. 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, and finished 631st of 945 entries. Free; the submission marks it as mobile-ready.
How it was built
Partially verifiedThe game's “About This Build” credits say: “The code was generated with Codex agent using GPT-5.4.” The same credits say GPT-5.4 also made the 2D icons, logo and textures and handled resizing, cropping and related asset edits, and that the music and sound effects were created with ElevenLabs. The official Vibe Jam 2026 submission lists “Codex Tool using GPT-5.4 and ElevenLabs” and answers Yes to the AI-written field.
- DeveloperOfficial Vibe Jam 2026 data: the entrant lists “Codex Tool using GPT-5.4 and ElevenLabs” and answers Yes to the AI-written field. — Vibe Jam
- OfficialJam rule 3: at least 90% of the code has to be written by AI. — Vibe Jam (Pieter Levels)
Built for the Cursor Vibe Jam 2026 on Three.js with the Codex agent running GPT-5.4, per the game's credits; GPT-5.4 also made the icons, logo and textures, and ElevenLabs the music and sound effects. The client is a single bundled script that connects over WebSocket to a multiplayer server at bumper-king.fadesignal.com.
- Engine / framework
- Three.js
- Languages
- Not disclosed
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“The code was generated with Codex agent using GPT-5.4.”Verification notes: AI use from the game's own “About This Build” credits (re-read on 5 Nov 2026) and the entrant's answers in the official Vibe Jam 2026 games data (made with “Codex Tool using GPT-5.4 and ElevenLabs”; engine ThreeJS; genre Action; multiplayer and mobile Yes, portal No; submitted 6 Apr 2026, 13:13 UTC, early in the jam; final rank 631 of 945 entries, no award); rule 3 on the jam page requires at least 90% AI-written code. Developer: the credits name Wellington and link x.com/xwerux, the handle in the jam data (display name Wellington; bio “Building cools things from time to time”); no full name, location or team size is given. Power-ups (speed, shield, magnet, mega), hazards (oil slicks, holes), the crown for the current leader and the bots come from the game's script; the bots are scripted, not AI models. The client connects to its own WebSocket server and loads Simple Analytics and the jam widget; no calls to AI services were found (checked 5 Nov 2026). Online population was not checked. Snake.io is named by the entrant as inspiration only; no names or assets from it were found. The jam page's widget counter showed 65 plays for bumper-king.vercel.app on 5 Nov 2026 (observed; sessions, not players or downloads, so not recorded as a metric). The release date is not stated; the jam submission is dated 6 Apr 2026.
Development history
Entered in the Cursor Vibe Jam 2026 (submission date in the official games data, UTC); the jam required at least 90% AI-written code. Final rank 631 of 945 entries, no award.
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)
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.
Not currently ranked.
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 |
| Bumper King (game page, script and “About This Build” credits) Wellington | Official site | Not confirmed | Nov 3, 2026 |
| Wellington (@xwerux) — X profile X | Social post | Not confirmed | Nov 3, 2026 |
| Official game page (language check) Wellington | Official site | Not confirmed | Nov 3, 2026 |
