Blockzilla
Play the kaiju: stomp through New York, mutate and grow in a browser roguelite.
Official site www.blockzilla.io, verified Nov 3, 2026. Entry URL submitted by the entrant (X handle markfersh) in the official Vibe Jam 2026 games data. The game page itself names no developer; its start screen credits Cursor, Claude Code and ElevenLabs.
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 Blockzilla
A browser roguelite in which you play a giant kaiju loose in New York. You smash blocks of the city, fight off the military and pick new mutations and powers as you level up and grow; runs end on a score you can post to a leaderboard. The developer pitches it as “Vampire Survivors meets Rampage” and says the idea came from loving Rampage as a child and wanting a power fantasy where you destroy the city instead of saving it. 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 Claude Code as the tool, and the game's start screen says it was “Built with Cursor & Claude Code”, with music and sound effects made with ElevenLabs. It finished 23rd of 945 entries. Free, on desktop and on phones held in landscape.
How it was built
VerifiedIn the official Vibe Jam 2026 submission the entrant lists Claude Code as the tool and answers Yes to the AI-written field. The game's start screen also names Claude Code, next to Cursor. No devlog describes how it was used or which model ran it, 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)
- DeveloperStart screen: “Built with Cursor & Claude Code · Music & SFX with ElevenLabs · 3D assets with Three.js”. — blockzilla.io
The game's start screen says it was “Built with Cursor & Claude Code”. The jam submission names only Claude Code, and nothing says which parts were done in Cursor.
Built for the Cursor Vibe Jam 2026 on Three.js, with Claude Code named in the submission and Cursor and Claude Code credited on the start screen. Per the same credit line, music and sound effects were made with ElevenLabs and the 3D assets were built with Three.js.
- Engine / framework
- Three.js
- Languages
- Not disclosed
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“Growing up as a kid, I loved playing Rampage as a huge monster. I fused the idea with roguelike mechanics to create a crazy power fantasy.”Verification notes: Tool (Claude Code), engine, genre, pitch, inspiration and the mobile and portal flags from the entrant's answers in the official Vibe Jam 2026 games data (submitted 28 Apr 2026; final rank 23 of 945 entries, no award); rule 3 on the jam page requires at least 90% AI-written code. The start screen credits “Cursor & Claude Code” for the build, ElevenLabs for music and sound effects and Three.js for the 3D assets. The game page names no developer: the name comes from the X profile @markfersh given in the jam data (display name Mark Fershteyn, location New York, USA, bio “7 figure SaaS CEO → AI trainer and game dev”), which links masteringai.io, a site whose founder is listed as Mark Fershteyn. Team size is not stated. On phones the game asks you to rotate to landscape. The page and its main script were checked for calls to AI services and none were found; the ElevenLabs audio ships as files with the game. The jam page's widget counters showed 463 plays and 1,044 portal transfers for blockzilla.io on 3 Nov 2026 (observed; sessions, not players or downloads, so not recorded as metrics). The release date is not stated; the jam submission is dated 28 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. Final rank 23 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.
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 |
| BLOCKZILLA — Browser Kaiju Roguelike (game page and start-screen credits) blockzilla.io | Official site | Not confirmed | Nov 3, 2026 |
| Mark Fershteyn (@markfersh) — X profile X | Social post | Not confirmed | Nov 3, 2026 |
| MasteringAI (founder: Mark Fershteyn) MasteringAI | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) blockzilla.io | Official site | Not confirmed | Nov 3, 2026 |
- AI tools named
- The official jam submission lists Claude Code only; the game's start screen says it was “Built with Cursor & Claude Code”. (Vibe Jam, blockzilla.io)
