Block Fall with ClaudeCode
Free · play online in your browser, no download
A falling-block puzzle with hold, a ghost piece and next-piece preview, the first of a planned eighteen genres. The developer says they did not write a single line of the C#: Claude Code did.
Official site midsummergames.itch.io, verified Nov 3, 2026. Linked from the developer's own note post announcing the game (“itch.io : https://midsummergames.itch.io/block-fall-with-claudecode”).
Where to play
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- Play free — itch.ioitch.ioReleasedFree
Plays in the browser on itch.io. No download.
Browser (no download) · Official link verified Nov 3, 2026.
- Play free — official siteBrowserReleased · On unityroomFree
Runs in a desktop browser. No download.
Browser (no download) · Official link verified Nov 3, 2026.
About Block Fall with ClaudeCode
Block Fall with ClaudeCode is a free falling-block puzzle game for desktop browsers, made in Unity. Seven kinds of blocks fall; you move and rotate them, clear full rows, and score more for clearing several rows at once, with a next-piece preview, a hold slot, a ghost piece that shows where the block will land, a title screen, pause and game over. The developer describes it as a Tetris-style game and, when announcing it, wrote that the name Tetris is a trademark of The Tetris Company and would not be used; the game is published under its own name. It plays with the arrow keys, Space for hard drop, Z and X or Up to rotate, C or Shift to hold, Esc or P to pause and R to restart. It is the first game in the developer's plan to make one game in each of eighteen genres with Claude Code and Unity, each under ten minutes of play and published as a WebGL build. The developer, who posts on note as 真夏。 and says they cannot write code, worked out the specification with Claude in its chat form, saved it as a Markdown file and asked Claude Code to implement it step by step; they write that they did not write a single line of C#. Claude Code also generated the sound effects and an eight-second music loop in code and added a one-button build menu to Unity. Free on itch.io and unityroom.
How it was built
VerifiedIn the note post (7 May 2026) the developer writes: “私は、C# のコードを1行も書いていません。全部、Claude Code というAIに作ってもらいました。” (I have not written a single line of C# code. I had an AI called Claude Code make all of it.) The developer started Claude Code in the terminal and asked in Japanese for each step of the specification, checked the result in Unity and reported problems such as blocks not falling, which Claude Code traced to a mismatch between Unity's old and new input systems. Claude Code proposed generating the sound in code and wrote the move, rotate, landing, line-clear and game-over sounds and an eight-second music loop; it also added a “BLOCK FALL” menu to Unity for one-click WebGL builds and fixed an API name that had changed in the newer Unity version.
- Developerunityroom description: “制作はClaudeCodeのみを使用しています” (only Claude Code was used to make it). — unityroom (MidSummer)
- DeveloperThe developer's plan post (3 May 2026): eighteen genres, one game each, made with Claude Code and Unity, with the falling-block puzzle first. — note (真夏。)
The developer decided the screens, rules, controls and scoring formula with Claude (“普通のチャット版”, the ordinary chat version), which wrote the specification that was then saved as a Markdown file for Claude Code.
Specification written with Claude chat and saved in the Unity project; Claude Code implemented it step by step while the developer tested each step in Unity and reported problems in Japanese. Unity with URP, exported as WebGL. All sound effects and the background loop are generated in code, with no audio files.
- Engine / framework
- Unity
- Languages
- C#
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- ~100% of shipped codeDeveloper Reportednote (真夏。)
“私は、C# のコードを1行も書いていません。全部、Claude Code というAIに作ってもらいました。”- Making a falling-block game in Unity without writing a line of code (note, Japanese)
- Plan: eighteen genres with Claude Code and Unity (note, Japanese)
Verification notes: AI use, features and the workflow come from the developer's note posts of 7 May 2026 (09:55 JST) and 3 May 2026 (20:36 JST), re-read on 7 Nov 2026; the 7 May post links the itch.io page. The unityroom page (posted 2 May 2026, updated 6 May 2026, about 10 minutes of play, 62 views and no ratings on 7 Nov 2026, observed) is on the developer's unityroom account MidSummer and gives the controls and “制作はClaudeCodeのみを使用しています”. The itch.io page (author MidSummerGames, status Released, HTML5, Unity, genre Puzzle; AI disclosure: AI Assisted, Code, Graphics, Sounds, Text) shows no description, publish date, rating or download count. The 100% code share is the developer's statement that they wrote no C#. On third-party IP: the developer calls the game “テトリス風” (Tetris-style) and wrote in the plan post that Tetris is a trademark of The Tetris Company and would not be used as the name; the store pages use the game's own name and we saw no Tetris name or logo on them, so no IP notice is recorded. The plan post also says the developer intends to keep publishing on itch.io and unityroom. The language of the in-game text was not checked; the Unity build was not inspected for AI service calls and the sources describe no AI used during play. The game was not played.
Development history
Posted on unityroom (updated 6 May 2026).
Observedunityroom (MidSummer)The developer announces a plan to make one game in each of eighteen genres with Claude Code and Unity, starting with a falling-block puzzle.
Developernote (真夏。)The developer announces the finished game on note with its itch.io page, saying they did not write a line of C#.
Developernote (真夏。)
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.
itch.io
Free in the browser (Unity WebGL), keyboard controls.
Not publicly available: itch.io rating, Gross revenue.
Browser (official site)
Free on unityroom; the page warns it may not run on smartphones.
No public metrics recorded for this listing.
Not publicly available: Concurrent players (site), Monthly revenue, Gross revenue.
Reviews & rankings
Not yet reviewed by our editors.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| コードを1行も書かずに、Unityでテトリス風ゲームを作った話 note (真夏。) · Japanese | Devlog | May 7, 2026 | Nov 3, 2026 |
| Claude Code と Unity で、ゲーム18ジャンルを全部作ってみる note (真夏。) · Japanese | Devlog | May 3, 2026 | Nov 3, 2026 |
| Block Fall with ClaudeCode by MidSummerGames itch.io | Store page | Not confirmed | Nov 3, 2026 |
| BlockFall (ClaudeCode) unityroom (MidSummer) · Japanese | Store page | May 2, 2026 | Nov 3, 2026 |
| Official game page (language check) MidSummerGames | Official site | Not confirmed | Nov 3, 2026 |
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