O'BLOCK
A free roguelike about one action, naming a price: haggle over sneakers from a Chicago block all the way up to billionaires. The developer says Claude Code wrote all of its Rust.
Links go to the official store or developer page. Last verified Nov 4, 2026.
Steam lists General Mature Content. The developer's note: “O'BLOCK is a satire about sneaker reselling and extreme wealth. You can knowingly sell counterfeit sneakers, pay bribes, short-sell rival companies and trigger a bank run for profit. Parody versions of famous public figures appear throughout. There is occasional mild language. No violence, sexual content, drugs or gambling.” (Steam)
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Rights holder / original work: Real public figures and sneaker brands (parodied)
The Steam content note says parody versions of famous public figures appear throughout, and the store page says every name in the game is a parody and that no real person, brand or company is involved with or endorses it. The store description mentions a pair of “Bred 1s”, a sneaker nickname. No source shows a licence or permission from any of the people or brands parodied. (Steam)
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Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- View on SteamSteamReleasedFree
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Desktop · Steam
About O'BLOCK
O'BLOCK is a free, menu-driven trading roguelike about haggling. You start on a Chicago block with US$300, a pair of sneakers and rent due in seven days, and buy and sell sneakers with people who never say what they will accept: every buyer and seller has a hidden price, a mood and limited patience, and answers your offer with a tell. The street price is a range that narrows as your reputation grows, fakes give themselves away by small details, and hitting someone's number exactly makes every buyer pay you more. Every seventh day you pay rent and must have met a sales quota; missing either earns a strike, and two strikes mean eviction. Between weeks you draft modifiers called angles into five ordered slots, twelve gate bosses each break a rule, and there are three modes (climb to a billion, a thirty-day summer and a daily seed), ten heat levels and six origins. Past the first billion a second layer opens with your own sneaker brand, a company to take public and a simulated economy with central banks, bond markets and banks that can fail. It is a satire with parody versions of public figures and brands (see the IP note). The developer, Matthew Busel, says an AI coding agent, Claude Code, wrote about 40,000 lines of Rust in 54 files from 26 rounds of the developer's notes, starting 15 September 2026, while the developer designed it, played it and wrote the feedback; the game runs on the developer's own Rust engine. Per the Steam AI disclosure, all in-game art and sound are generated procedurally by the game's own code. Free on Steam for Windows since 20 Oct 2026, in 16 languages; an optional US$4.99 Supporter Pack holds the soundtrack, stems and art and adds no gameplay.
Screenshots and art
O'BLOCK key art · Steam store artwork
How it was built
Partially verifiedThe developer says: “I did not type the Rust. An AI coding agent (Claude Code) wrote about 40,000 lines in 54 files over 26 numbered rounds of my notes plus a release push, starting September 15.” The developer designed the game, played it, wrote the feedback and “said no a lot”. In round 26, on 29 Sep 2026, the agent wrote the post-game finance layer (finance.rs, 2,185 lines, and banks.rs, 713 lines) in one round. A balance harness built into the shipping executable plays whole runs headless with bots; the developer ran 37,800 bot runs on the launch build on 19 Oct 2026.
- DeveloperSteam AI Generated Content Disclosure: “The game's code, in-game writing and store text were written with an AI assistant and reviewed and edited by the developer.” It adds that nothing is generated by AI while you play and that the game never connects to an AI service. — Steam
The developer wrote design notes and feedback in 26 numbered rounds plus a release push, and Claude Code wrote the Rust. The game runs on the developer's own Rust engine, Proof Engine. Per the Steam disclosure, all in-game art and sound are generated procedurally by the game's code, with no AI image, music or voice models in the game; some promotional and Supporter Pack artwork was made with an AI image generator. The developer says the game has 192 original songs with 768 live stems; the launch build shipped them as lossless audio (29.8 GB), and on launch evening a 3.8 GB Ogg Vorbis build became the default, with the lossless build kept as a public beta branch.
- Engine / framework
- Proof Engine (the developer's own Rust engine)
- Languages
- Rust
- Team size
- Not disclosed
- Initial build time
- From 15 Sep 2026 to the 20 Oct 2026 launch: 26 rounds of notes plus a release pushDeveloper ReportedDEV Community (mattbusel), originally tensorust.com
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- ~100% of shipped codeDeveloper ReportedDEV Community (mattbusel), originally tensorust.com
“I did not type the Rust. An AI coding agent (Claude Code) wrote about 40,000 lines in 54 files over 26 numbered rounds of my notes plus a release push, starting September 15.”Verification notes: The AI claim rests on the developer's DEV Community post of 19 Oct 2026 (a cross-post from tensorust.com), which says Claude Code wrote every line of the Rust, about 40,000 lines in 54 files, and on the Steam AI disclosure, which says the code, in-game writing and store text were written with an AI assistant and reviewed and edited by the developer; both re-read on 4 Nov 2026. The 100% AI code share reflects “An AI coding agent wrote every line of its Rust”. Runtime: the disclosure says nothing is generated by AI while you play and the game never connects to an AI service. Features, modes and counts come from the Steam store description; release date, price, platform and the 16 supported languages from the Steam store API; the review count from the store page on 4 Nov 2026. Location from tensorust.com (Tensorust LLC, a New York software studio founded by Matthew Busel). The launch-day post (20 Oct 2026) reports Steamworks figures read at 5:24 PM ET that day: 2,077 free activations, 16 accounts that launched the game, a peak of 2 concurrent players and one Supporter Pack sale. These are developer-reported launch-day numbers, so they are kept here and not recorded as metrics; activations of a free game are not downloads or players. Steam's auto-generated ratings are 12 in Brazil and 6 in Germany. The game was not played.
Development history
Claude Code starts writing the game from the developer's notes, per the developer.
In round 26 the agent writes the post-game finance layer in a single round, per the developer.
The Complete Supporter Pack is released on Steam; the developer publishes a 37,800-run bot test of the launch build.
Released free on Steam for Windows. That evening the default build shrinks from 29.8 GB to 3.8 GB, per the developer.
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.
Steam
Free on the Steam store API on 4 Nov 2026. Windows only. The optional O'BLOCK - Complete Supporter Pack (US$4.99, released 19 Oct 2026) holds the soundtrack, stems and art and adds no gameplay, per the store page.
All reviews as shown on the store page on 4 Nov 2026; Steam shows no score until a game has 10 reviews.
Not publicly available: Concurrent players, Positive Steam reviews, Estimated owners, Copies sold, Gross revenue.
Reviews & rankings
Not yet reviewed by our editors.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| O'BLOCK on Steam (store page incl. AI Generated Content Disclosure) Steam | Store page | Not confirmed | Nov 3, 2026 |
| Sweeney wants rockets. 37,800 bots crashed my vibe-coded game DEV Community (mattbusel), originally tensorust.com | Devlog | Oct 19, 2026 | Nov 3, 2026 |
| 2,077 claimed our free Steam game. 16 played it. 30 GB did that DEV Community (mattbusel) | Devlog | Oct 20, 2026 | Nov 3, 2026 |
| About Tensorust: the studio behind the data and tools Tensorust LLC | Official site | Not confirmed | Nov 3, 2026 |
