The Last Mail Cat
Free · play online in your browser, no download
Cats race to deliver lost mail across a small island before night creatures steal it.
Official site mail-cat-multiplayer.janis-rozenfelds.workers.dev, verified Nov 3, 2026. The game's footer credit “by Janis Rozenfelds” links the entrant's X account roziits; the game is hosted on a janis-rozenfelds workers.dev subdomain and is 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 browser. No download.
Browser (no download) · Official link verified Nov 3, 2026.
About The Last Mail Cat
A 3D online multiplayer delivery game in the browser. In the entrant's words, cats race to deliver lost mail across a small island before night creatures steal it; the game's script includes cargo boxes to carry, mailboxes to deliver them to, boats and a day counter. The entrant says Death Stranding inspired it with its feeling of movement, delivery and quiet adventure, and that they wanted to explore that in a lighter and more playful cat world. The game's footer reads “Made with Codex, Claude and ChatGPT Images 2.0 by Janis Rozenfelds”. 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; the official submission lists Codex as the tool. It finished 675th of 945 entries. Free, for desktop browsers.
How it was built
Partially verifiedIn the official Vibe Jam 2026 submission the entrant lists Codex as the tool and answers Yes to the AI-written field. The game's footer names Codex first: “Made with Codex, Claude and ChatGPT Images 2.0”. Which model ran Codex is not stated, and the submission covers the jam version only.
- OfficialJam rule 3: at least 90% of the code has to be written by AI. — Vibe Jam (Pieter Levels)
- DeveloperGame footer: “Made with Codex, Claude and ChatGPT Images 2.0 by Janis Rozenfelds”. — Janis Rozenfelds
Named in the game's footer (“Made with Codex, Claude and ChatGPT Images 2.0”); what Claude did is not stated.
Built for the Cursor Vibe Jam 2026 on Three.js with Codex named as the tool, with the Rapier physics engine and a Vue interface; multiplayer runs over WebSocket through PartyKit, and media files are served from the developer's own media domain. The footer also credits Claude, and ChatGPT Images 2.0, an image generator.
- Engine / framework
- Three.js
- Languages
- Not disclosed
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“Cats race to deliver lost mail across a small island before night creatures steal it.”Verification notes: Tool (Codex), engine (ThreeJS), genre (“Adventure, Simulation, Cozy Delivery”), pitch, inspiration and the multiplayer (Yes), mobile (No) and portal (Yes) flags from the entrant's answers in the official Vibe Jam 2026 games data (submitted 1 May 2026, 12:53 UTC, on the deadline day; final rank 675 of 945 entries, no award); rule 3 on the jam page requires at least 90% AI-written code. The footer credit comes from the game's script, re-read on 5 Nov 2026. Developer: the footer credits Janis Rozenfelds with a link to x.com/roziits, the handle in the jam data (display name Janis Rozenfelds, location Seoul, South Korea, linking janisrozenfelds.com, which returned an error on 5 Nov 2026); team size is not stated. Gameplay is described from the entrant's pitch; cargo, mailboxes, boats and the day counter come from the game's scripts, and the game was not played through. The game connects to its own PartyKit WebSocket server and media domain; no calls to AI services were found (checked 5 Nov 2026). Online population was not checked. Death Stranding is named by the entrant as inspiration only; no names or assets from it were found. The jam page's widget counter showed 55 plays for mail-cat-multiplayer.janis-rozenfelds.workers.dev 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 1 May 2026.
Development history
Entered in the Cursor Vibe Jam 2026 on the deadline day (submission date in the official games data, UTC); the jam required at least 90% AI-written code. Final rank 675 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 |
| The Last Mail Cat (game page, scripts and footer credit) Janis Rozenfelds | Official site | Not confirmed | Nov 3, 2026 |
| Janis Rozenfelds (@roziits) — X profile X | Social post | Not confirmed | Nov 3, 2026 |
| Official game page (language check) Janis Rozenfelds | Official site | Not confirmed | Nov 3, 2026 |
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