SLIME POP 2
Free · play online in your browser, no download
A falling-slime puzzle in which you can also swap the slimes already stacked to set up chains, with special abilities and local two-player battles. The developer, who cannot read code, rebuilt it with Codex.
Official site kirintaro.itch.io, verified Nov 3, 2026. Linked as the free release (『SLIME POP 2』無料公開中！) in the developer's own note article; itch.io author Kirintaro.
Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — itch.ioitch.ioReleasedFree
Plays in the browser on itch.io. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About SLIME POP 2
SLIME POP 2 is a free falling-block puzzle game for the browser. Coloured slimes fall in pairs, and you match three or more of one colour to pop them and set off chains; you can also click or tap slimes already on the board to swap them, to set up chains or get out of a tight spot. Clearing five or more at once creates a bomb that clears part of the board. You pick a character with a special ability: version 1.1 (5 November 2026) brought the roster to seven, with abilities such as a fire breath that clears two rows, flipping the board upside down or randomising the slimes' colours. There are an endless mode, 1-, 3- and 5-minute time attacks with rankings, and local two-player battles, now with a gamepad each. It plays on PC with mouse, keyboard or gamepad and on phones with touch. The developer, Kirintaro, writes on note that the idea came from two favourite puzzle games, Puyo Puyo and Panel de Pon. The developer has almost no programming knowledge and cannot read code: the first version, a single HTML file, came from asking the free tier of ChatGPT, and when fixes started breaking other things the developer subscribed to ChatGPT Plus, brought in Codex and rebuilt the game from scratch as SLIME POP 2. The feel, such as falling speed, clear timing and chain pacing, was tuned by playing again and again, helped by a debug mode added along the way. Free on itch.io (name your own price) and on フリーゲーム夢現. Text in English and Japanese; voices in Japanese.
How it was built
Partially verifiedThe developer's note article (5 Nov 2026) says the developer had AI make the game, knowing almost nothing about programming: “こちらはコードが読めないのでAIに頼るしかないのですが” (I can't read code, so I can only rely on the AI). After the patched-together first version kept breaking, the developer rebuilt the game from the structure up: “ここでやっとPlusに課金しCodexを導入 こうしてSLIME POP は2になりました” (at last I paid for Plus and brought in Codex; that is how SLIME POP became 2). The developer adds that AI could produce the rules, but asking it to “make it feel better” did not always work, so the feel was tuned by repeated play. The model is not named.
- Developernote article: “ふと思いつきでAIにゲームを作らせてみることにしました” (on a whim, I decided to have AI make a game) and “AIのおかげでプログラミングが分からなくてもゲームを作れるようになりました” (thanks to AI, I can now make games without understanding programming). — note (きりん太郎 / kirintaro)
- Developeritch.io AI disclosure: AI Assisted, Code, Graphics, Sounds, Text. — itch.io
The first version, a single HTML file, was made by asking the free tier of ChatGPT (“無課金チャッピー”), per the same article.
First a single HTML file from free ChatGPT, then a from-scratch rebuild with Codex once the specs were sorted out; a debug mode (full gauge, test boards, speed and volume values) was added for tuning. The browser build is plain JavaScript modules (observed).
- Engine / framework
- None (JavaScript modules, observed in the browser build)
- Languages
- JavaScript
- Team size
- Not disclosed
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“AIのおかげでプログラミングが分からなくてもゲームを作れるようになりましたが、面白いゲームにするにはまだまだ試行錯誤が必要そうです”- Developer's note article on making and publishing the game with AI (Japanese)
- Ver. 1.1 update devlog (itch.io)
Verification notes: AI use and the development story come from the developer's note article of 5 Nov 2026 (18:31 JST), re-read on 6 Nov 2026; it links the itch.io page. The article does not state a share of AI-written code; it says the developer cannot read code and relied on AI, and that the game was rebuilt after Codex was brought in. Gameplay, controls, languages (English and Japanese, with Japanese voices), the AI disclosure and dates come from the itch.io page (published 30 Oct 2026, 07:57 UTC; its release-date field reads 29 Oct 2026, 15:00 UTC, which is midnight on 30 Oct in Japan; updated 5 Nov 2026, 03:05 UTC; status Released; HTML5). The page text still says six characters, while the Ver. 1.1 devlog (5 Nov 2026) says four new characters bring the playable roster to seven. Puyo Puyo and Panel de Pon are named by the developer as inspiration for the rules; no names or assets from either were found on the itch.io page. The browser build's 68 script modules were fetched on 6 Nov 2026; their only network requests load sound files, and no AI services are called. itch.io shows no rating or download count. The フリーゲーム夢現 listing is not tracked. The game was not played. No name or location is given.
Development history
Published on itch.io (07:57 UTC).
Observeditch.ioVersion 1.1: four new characters (seven in all), gamepad character select for local two-player, smoother controls and new effects.
Developeritch.io (Kirintaro devlog)The developer's note article on making the game with ChatGPT and Codex without being able to read code.
Developernote (きりん太郎 / kirintaro)
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 (HTML5) on PC and phones; name your own price, with optional donations.
Not publicly available: itch.io rating, Gross revenue.
Reviews & rankings
Not yet reviewed by our editors.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| プログラミングもコードも全く分からないど素人、AIとゲームを作って公開した話 note (きりん太郎 / kirintaro) · Japanese | Devlog | Nov 5, 2026 | Nov 3, 2026 |
| SLIME POP 2 by Kirintaro itch.io | Store page | Oct 30, 2026 | Nov 3, 2026 |
| SLIME POP 2 Ver.1.1 Update: 4 New Characters & Improved Local Multiplayer itch.io (Kirintaro devlog) | Devlog | Nov 5, 2026 | Nov 3, 2026 |
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