Frontline Zero
Free · play online in your browser, no download
A free-to-play classic base-building RTS of modern war, Ukraine against Russia, with drones, jammers and artillery on twelve maps based on real places.
Official site www.frontlinezero.com, verified Nov 3, 2026. Linked from the developer's own Reddit post on r/ClaudeCode; the site links the studio site 556games.com, which names Hyun Seo.
Where to play
Every platform this game is on. Links are checked against official sources; we never host or mirror games.
- Play free — official siteBrowserReleased · The site says the game is in active developmentFree-to-Play
Runs in a desktop or mobile browser. No download.
Browser (no download) · Mobile · Official link verified Nov 3, 2026.
About Frontline Zero
A free-to-play real-time strategy game in the browser, set in the ongoing war between Ukraine and Russia. You build a base from a sidebar, hold towns, industry and oil fields for income, climb a tech tree and put together a combined-arms force of infantry, armour, artillery, aircraft and drones, with air defence and jammers to answer them; trenches, garrisoned buildings and minefields make ground cheap to hold. Ukraine plays precision and dispersion, Russia mass and fortification, and every soldier answers in Ukrainian or Russian. Twelve maps are modelled on real places, among them Hostomel, Kharkiv, Mariupol, Bakhmut and Avdiivka; the site says every person in the game is fictional. You can play skirmishes against the computer at six levels, one against one or two against two, a six-chapter training, and online multiplayer, all free with no daily limit. The developer, Hyun Seo of the one-person studio 556 Games, says the gameplay is inspired by Red Alert 2, with a zone-based economy like Company of Heroes and an interface inspired by C&C and StarCraft. Per the developer, it was made with Claude Opus 5.5, with Fable helping on some netcode, and most of the coding was done by Claude Code while the developer reviewed the pull requests and tested. A one-off US$5 Supporter purchase adds a badge, the Map Editor and community maps, save and load, cheats and a battle sandbox; the studio says 10% of profit goes to humanitarian aid through UNITED24.
Content note: Set in the ongoing Russia–Ukraine war, with maps modelled on real battle sites (Hostomel, Mariupol, Bakhmut and others) and modern weapons; the site says every person in the game is fictional. (556 Games)
How it was built
Partially verifiedIn a post on r/ClaudeCode (16 Oct 2026, UTC) the developer writes: “It was made with Opus 5.5 mainly with Fable helping with some netcode. Uses a Webgl renderer. Most of the coding was done by Claude Code with me reviewing the PRs and of course testing it.” The stack is Vercel for hosting, Supabase for accounts, Cloudflare Workers for the game network, Stripe for payments and Google Workspace for sign-in. Sprites come from a 3D-to-sprite pipeline (Tripo to voxels to sprites), sometimes with Qwen running locally for high-volume image processing, and the sound effects from kits or royalty-free sites.
Made the paintings: “Paintings are from Gemini. I am hoping I can replace most of it with a real artist soon.” Not used for code.
A browser game with a custom WebGL engine (served as “@webrts/engine” in the site's module map), written mostly by Claude Code with Claude Opus 5.5, with Fable helping on netcode; the developer reviewed the pull requests and tested. Hosting on Vercel, accounts on Supabase, the multiplayer network on Cloudflare Workers and payments through Stripe. Sprites are rendered from 3D models (Tripo, then voxels, then sprites), the paintings were generated with Gemini and the sound effects come from kits and royalty-free sites. The skirmish opponent is the game's own computer player; the game's scripts call no AI services.
- Engine / framework
- Custom WebGL engine
- Languages
- Not disclosed
- Team size
- 1 (solo)Developer Reported556 Games
- Development time
- Not disclosed
- Development cost
- Not disclosed
- AI-written code
- Not disclosed
“Most of the coding was done by Claude Code with me reviewing the PRs and of course testing it.”Verification notes: AI use and stack from the developer's post by u/Savings-Theme4022 on r/ClaudeCode (16 Oct 2026, 19:55 UTC), read from the Arctic Shift Reddit archive on 8 Nov 2026 (no replies archived); the post links frontlinezero.com. Features, maps, modes, pricing and the UNITED24 pledge from the official site's home and About pages; studio and developer from 556games.com (“An independent game studio of one, run by Hyun Seo”), all re-read on 8 Nov 2026. The Red Alert 2, Company of Heroes, C&C and StarCraft comparisons are the developer's. The site lists the App Store, Google Play, Steam and GOG versions as coming soon, so only the web version is listed. No release date is stated. Fable is named by the developer as helping with netcode; what Fable is (a model or a tool) is not explained in the post, so it is not recorded as a tool. No share of AI-written code is given beyond “most of the coding”. The game's six module scripts (about 2.6 MB) were fetched: they contain no AI service addresses (only the studio, Stripe, CrazyGames SDK, YouTube, Discord, X and GitHub links); the site also loads Cloudflare analytics. The game was not played.
Development history
The developer shares the game on r/ClaudeCode, saying most of the coding was done by Claude Code.
DeveloperReddit (u/Savings-Theme4022)- As of November 2026
Community maps and the Map Editor (beta) are available to Supporters; app and Steam/GOG versions are listed as coming soon.
Observed556 Games
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)
Free: skirmishes against the computer, online multiplayer, training and the handbook, with no ads. An optional one-off US$5 Supporter purchase on the website adds a badge, the Map Editor and community maps, save and load, cheats in skirmishes and the Battle Sandbox, with no online advantage. Apps for iPhone, iPad, Mac, Android and Steam/GOG are listed as coming soon at US$4.99.
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.
Not currently ranked.
Sources
| Source | Type | Published | Accessed |
|---|---|---|---|
| Frontline Zero - F2P Multiplayer RTS (r/ClaudeCode) Reddit (u/Savings-Theme4022) | Social post | Oct 16, 2026 | Nov 3, 2026 |
| Frontline Zero — Free-to-Play Real-Time Strategy 556 Games | Official site | Not confirmed | Nov 3, 2026 |
| About Frontline Zero — a free-to-play real-time strategy game 556 Games | Official site | Not confirmed | Nov 3, 2026 |
| 556 Games 556 Games | Official site | Not confirmed | Nov 3, 2026 |
| Official game page (language check) 556 Games | Official site | Not confirmed | Nov 3, 2026 |
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