Pokémon Battle Advanced: Real Time FireRed in Your Browser, and What Actually Runs It

2026-10-15 · News and analysis

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Pokémon Battle Advanced went up about four days ago and has already been patched. It rebuilds the opening hours of FireRed and LeafGreen as an HD-2D world, which means pixel art sprites moving through real 3D environments with real lighting. Then it throws out turn based combat entirely.

Every battle happens in real time. You move your Pokémon around the arena yourself, line up attacks, dodge, sprint and jump.

It is free, it runs in a browser tab, and you can try it in the next two minutes. That last part is why it is worth writing about, and it is also the part that makes the hardware question stranger than usual.

The Short Version

• What it is: a standalone fan game built in Godot Engine 4.7, not a ROM hack
• What the demo covers: your bedroom in Pallet Town through Brock's Boulder Badge in Pewter City
• The hook: real time battles instead of turn based ones, including gym fights you have to win live
• Where it runs: a browser, Windows, or macOS. There is no Linux build and no Android APK
• Best experience: the native Windows or macOS download, not the browser
• Worst experience: anything made by Apple that runs Safari underneath
• Status: the developer labels it a prototype, and performance is a known problem
• AI: the page carries itch.io's own AI Assisted and AI Code disclosure tags

It Is Not a ROM Hack

This matters more than it sounds, because it decides whether any of your handhelds can open it.

Early coverage has filed this under FireRed hacks. One outlet's headline calls it a Fire Red hack outright. It is an easy mistake to make, since the game is a loving copy of FireRed's opening and uses FireRed's towns, trainers and Pokémon.

But there is no patch here, and no base game. You never supply a ROM. A ROM hack is a patch file that you apply to a copy of a game you dumped from your own cartridge, and the result runs in an emulator. This is a compiled application that was written from nothing in a game engine. Nothing to dump, nothing to patch, no emulator involved.

Our Pokémon fan games guide covers that distinction properly, and our ROM hacks guide covers the other category.

The practical version is short. A FireRed ROM hack runs on every handheld you own, including a 40 dollar one. This does not.

What the Demo Covers

The route is the one you remember. Pallet Town, Route 1, Viridian City, Route 22, Route 2, Viridian Forest and Pewter City, with the people and wild Pokémon of FireRed in roughly their old places. The world has been rebuilt larger than the original, so there is more space to walk around in.

It ends after Brock. That is the whole demo.

What fills it out is the presentation. There is a day and night cycle with lighting that changes to match. Wind moves the flowers. Fireflies drift around in the evening. Weather and water are both real 3D effects rather than tile animations. If you have seen Pokémon Gamma Emerald, it is the same basic idea applied to Kanto, in a different engine.

The Battles Are the Point

Turn based combat is gone. In its place:

• You control your Pokémon directly and aim attacks yourself, with W, A, S and D mapped to its four moves
• You can dodge, sprint and jump out of the way of incoming attacks
• You can tag team wild Pokémon, sending a second fighter into a wild battle or switching which one you are controlling
• Fights happen on land, in water and in the air, with water types swimming and flying types sweeping overhead
• Type matchups still apply. Super effective hits, status conditions and stat changes all carry over from the original games
• Gym fights are boss fights that you have to finish in real time before you can move on

Keyboard controls are arrow keys to move with Shift to run, E to interact, Q to jump, Z for items, 1 through 6 for your party and Esc for the menu. A gamepad works and the page documents an Xbox button mapping. There are on screen touch controls too, tucked under OPTIONS and then TOUCH CONTROLS.

Which Handhelds Can Actually Run It

Here is the part nobody else has written down, and it comes straight off the download list.

The game ships a Windows build, a macOS build and a browser version. There is no Linux build and no Android APK. That single fact decides everything below.

That bottom row is the one that will disappoint people, and it is worth being blunt about why. Those handhelds are emulator boxes. ArkOS, muOS, KNULLI and OnionOS have no way to launch a compiled Godot application, and there is no web browser to fall back on. The game is not too demanding for them. There is simply no door.

Why Apple Hardware Is the Bad Path

The developer's own note says Chrome or Firefox work best, and that Safari has WebGL 2.0 issues.

That is not a small footnote if you were planning to play on an iPhone or iPad. Every browser on iOS uses Safari's engine underneath. Installing Chrome on an iPhone gets you Safari with a different icon, so the usual workaround does not help you here.

This is not just one developer's bad luck either. Godot's own documentation says the same thing, recommending a Chromium based browser or Firefox because Safari has several WebGL 2.0 problems that other browsers do not.

One more small thing that catches everyone. You may need to click the page once before the audio starts.

The Browser Version Is Not the Same Game

This is the finding that surprised us, and it is a direct consequence of how Godot exports to the web.

Godot 4 has three ways to draw a scene. Forward+ and Mobile are the modern ones. Compatibility is the oldest and lightest. On the web, Godot can only use Compatibility, because that is the only one that maps onto WebGL 2.0. Forward+ and Mobile are not supported on the web platform at all, and Godot does not support WebGPU yet.

So the browser version of Battle Advanced is running Godot's most basic renderer. It has no choice. The downloadable Windows and macOS builds are under no such restriction.

The honest reading is this. If you play in a browser and think the lighting looks flatter than the screenshots, you may not be imagining it, and the native download is the version to judge the game on. Godot's documentation is also direct about the performance gap, saying native builds will always perform better by a significant margin.

The 40 Dollar Handheld Is One Export Away

Now the interesting part, and the reason this game is more portable than it currently looks.

Godot is the friendliest engine in the world for cheap Linux handhelds. It exports to ARM Linux natively, and PortMaster ships Godot runtimes for aarch64 covering versions from 2.1.6 all the way to 4.7.1, with Mono variants alongside them. Most of the native ARM ports in PortMaster's catalogue are Godot, LÖVE or SDL games for exactly this reason.

Battle Advanced is built in Godot 4.7.

Read those two sentences together. The runtime this game would need on an Anbernic RG40XX already exists, already installed by PortMaster, already working. The missing piece is not the hardware, the firmware or the engine. It is a Linux ARM64 export that the developer has not made.

We want to be careful here, because this is a possibility and not a plan. Nobody has announced a port. A real port also needs more than an export button, since someone has to map the controls, pick a resolution the device can actually hit, and get a prototype's performance under control on a chip far weaker than a laptop. Real time 3D combat is a much heavier ask than the RPG Maker fan games already in PortMaster's library.

But of all the Pokémon fan games we have covered, this is the one where the path to a 40 dollar handheld is shortest. Our PortMaster guide explains how that library works if you want the background.

What the AI Tags Actually Say

The project's own page carries two of itch.io's disclosure tags: AI Assisted and AI Code.

That is worth stating plainly, and it is worth stating where it came from. This is the developer's own disclosure, written by the developer, not an accusation from anyone. Early coverage has described AI as having assisted with the coding alongside human development, which matches what the tags claim.

There is a small irony in the engine choice. Godot, as a project, bans AI authored contributions to its core engine. That rule governs people submitting code to Godot itself. It places no restriction on what games built in Godot may do, so there is no conflict here. It is just a neat illustration of how unsettled this all is right now, with an engine that refuses AI contributions being used to build a game that discloses them.

We have written about where those lines are being drawn in emulator projects and their AI code bans, and about the same argument playing out in the recomp scene. Our position on the reporting side is unchanged. A disclosure is a fact we can repeat. Anything beyond it would be a guess, and we do not have a breakdown of how much of this game is which.

It Is Still a Prototype

The developer labels it a prototype, and that label is doing real work.

Performance is the known issue. Multiple players have raised it, and the developer has said in response that performance is one of the things they hope to fix in the next release. Take that seriously when you pick a platform. It is the strongest argument for using the native download over the browser, and against expecting much from a mid range Android handheld.

The other thing to keep in mind is the one that hangs over this entire category. Nintendo has taken down standalone Pokémon fan games before, and Pokémon Uranium and Pokémon Prism are the two everyone remembers. A faithful HD-2D remake of Kanto is not a quiet project. Nobody can tell you what will or will not happen to it.

The practical advice is the same as always. If it interests you, download the build while it is there, and keep the installer.

Where to Play It

For the native build, which is the version worth judging, you want a Windows handheld.

For the browser route on something portable with real controls, an Android handheld is the pick, and a device with actual sticks and buttons beats a phone with a grip clipped to it.

Our best retro handhelds guide covers the options across every tier, and Linux vs Android handhelds is the one to read if this article just convinced you that the cheap Linux tier has limits.

Frequently Asked Questions

Is Pokémon Battle Advanced a ROM hack?

No. It is a standalone application built in Godot Engine 4.7. There is no patch file, no base game and nothing to dump from a cartridge. You download a build and run it, or you play it in a browser. Some early coverage has called it a FireRed hack, which is understandable given how closely it follows FireRed, but it is not accurate.

Do I need a Pokémon FireRed ROM to play it?

No. Nothing about this game involves a Nintendo game file. It is an original program that recreates FireRed's opening, so there is nothing to supply and nothing to patch.

Can I play Pokémon Battle Advanced on an Anbernic or Miyoo handheld?

No. Those devices run emulators, and this is a compiled Godot application rather than emulator content. They also have no web browser, so the browser version is not a way around it. Android handhelds, Windows handhelds, a Steam Deck, or a PC are the options.

Can I play it on a Steam Deck?

Yes, with a small detour. There is no Linux build, so the two routes are running the Windows build through Proton or opening the browser version in desktop mode. Neither is tested by the developer, and we have not tested them either.

Does it work on an iPhone?

It will load, but it is the worst platform for it. The developer warns that Safari has WebGL 2.0 problems, and Godot's own documentation says the same. Every browser on iOS uses Safari's engine underneath, so installing Chrome does not avoid the issue.

How long is the demo?

It runs from your bedroom in Pallet Town to beating Brock in Pewter City, taking in Route 1, Viridian City, Route 22, Route 2 and Viridian Forest. That is the full extent of it, and the developer calls the project a prototype.

Why does it run badly?

Performance is a known and acknowledged problem, and the developer has said it is something they hope to address in a future release. The browser version also has a structural disadvantage, because Godot web exports can only use the engine's oldest and lightest renderer. The native Windows or macOS download is the faster option.

Was Pokémon Battle Advanced made with AI?

The project's page carries itch.io's AI Assisted and AI Code disclosure tags, which is the developer's own disclosure. No detailed breakdown of which parts were AI assisted has been published, so anything more specific than that would be speculation.

Could it ever run on a cheap handheld?

Possibly, and it is closer than you would think. PortMaster ships Godot runtimes for ARM handhelds up to version 4.7.1, and this game is built in Godot 4.7, so the runtime it needs already exists on those devices. What is missing is a Linux ARM64 build from the developer. No port has been announced, and real time 3D combat would be demanding on that hardware even with one.

Related Reading

• Best Pokémon Fan Games in 2026, and Which Handhelds Actually Run Them
• Pokémon Arena 2D: You Cannot Play It Yet, and the One You Can Is a Different Game
• Best Pokémon ROM Hacks for Handhelds
• Daily Red, the Pokémon Wordle Its Creator Archived on Day One
• Pokémon Survivor Burst: What It Is, and What Runs It
• PortMaster Complete Guide
• Emulator Projects Are Banning AI Code
• Linux vs Android Handhelds: Which One Should You Buy

Written 15 October 2026. This project was four days old and had already been patched when we wrote this, so the download list and the performance picture are both moving. The build list is the detail most likely to go stale, and it is the one the hardware table depends on.