Free Suika-Style Planet Merge Game — Single HTML File (Cosmic Merge 2D)

Cosmic Merge 2D is the Suika Game formula relocated to deep space, in a single dependency-free HTML file. Aim with mouse or finger, drop a celestial body, and let 2D gravity take over: when two bodies of the same tier touch, they fuse into the next one — Meteor, Moon, Mercury, Mars, Earth, Neptune, Saturn, Jupiter, Sun and finally a Supernova.

The physics is the star of the show: mass-weighted elastic circle collisions resolved over five solver iterations per frame, which is what makes tall wobbling stacks settle believably instead of jittering. Pile past the dashed danger line for too long and the run ends. Merges throw radial particle bursts, every action has an oscillator-synthesized sound (no audio files anywhere), a twinkling starfield runs behind the board, and your best score persists in localStorage.

There is no engine, no sprite sheet and no build step — view-source shows you the entire game: the tier table, the collision solver, the renderer. That makes it as good a learning artifact as it is a coffee-break game.

Feature	Cosmic Merge 2D (single file)	Typical engine-based equivalent
Files to deploy	1 HTML file	Framework bundle + assets + build output
External dependencies	0	Game engine (Phaser/Unity/…) + toolchain
Art & audio assets	None — Canvas drawing + synthesized sound	Sprite sheets, audio files
Mobile touch support	✓ built in	Varies
Embed with an iframe	✓ anywhere	Usually
Readable, remixable source	✓ ~494 lines, MIT	Minified bundles

1. Download and unzip — you get index.html and a README.

2. Double-click index.html, or upload it to any static host (shared hosting, GitHub Pages, Netlify, an S3 bucket… anything that serves a file).

3. To embed it in an existing site: <iframe src="/games/index.html" width="860" height="620"></iframe>. That's the whole deployment story.

Community build: one of six HTML5 games generated by the site's owner with Google Gemini 3.1 Pro — each a true zero-shot: one prompt, one file, ~12 seconds of generation, no external libraries, images or audio (all sound is Web Audio synthesis). The exact prompt, verbatim (in Turkish, as written):

Tek bir HTML dosyası içinde, hiçbir harici kütüphane veya görsel/ses dosyası kullanmadan çalışan 'Cosmic Merge 2D' adında Suika tarzı bir uzay fizik oyunu yaz. 2D yerçekimi, kütle oranlı elastik çember çarpışma çözümü (5 iterasyonlu), 10 kademeli gezegen evrim sistemi, parçacık patlamaları, Web Audio API ile sentezlenmiş ses efektleri, tehlike sınırı sayacı ve localStorage rekor kaydı içersin. Mobil dokunmatik ve masaüstü fare uyumlu olsun.

Verified before publishing: every file read line-by-line, UI strings localized to English for this showcase, and each game deployed and played on the live demo. The five-iteration collision solver is genuinely in there and stacks behave like Suika stacks.