Pokemon Emerald Ported to WebAssembly

Native Browser Execution via WebAssembly

Pokemon Emerald has been ported to the web using WebAssembly (WASM), allowing the game to run directly in the browser. Unlike traditional browser-based emulation, which runs a Game Boy Advance (GBA) emulator written in JavaScript or WASM to execute a ROM, this project compiles the game's own logic and assets into WASM. This is made possible by a community-led decompilation project that provided the source code for Pokemon Emerald, which was then targeted for the web.

Performance and Controls

The port features a "Speed 1x" toggle, allowing users to accelerate gameplay to skip tedious sections. While the project title suggests performance as high as 100k FPS, user reports indicate varying results, with some users reporting 29 FPS on their specific hardware.

Keyboard Controls:

  • Movement: Arrow keys
  • Button A: Z key
  • Button B: X key
  • Start: Enter key
  • Select: Shift key

Current Technical Limitations and Bugs

While the port provides a functional experience, users have identified several stability and gameplay issues that may hinder progress:

Gameplay Crashes

  • Menu Freezes: Multiple users reported crashes when selecting "Pokemon" from the "Fight/Bag/Pokemon/Run" battle menu.
  • Event Triggers: Reports indicate the game freezes when a starter Pokemon evolves at level 16.
  • Item Usage: Some users experienced crashes when using a potion during battles (e.g., against May).

Visual and Input Bugs

  • Text Rendering: Some entities are displayed as numbers instead of text (e.g., "You received a 6" instead of an item name).
  • Input Lag: Some users reported that the A button press is not registered if released and re-pressed too quickly.
  • Navigation: Reports of wonky behavior in the name selection menu.

Missing Features

  • Audio: The current build lacks sound, though community members have mentioned working on forks to add audio support.
  • Save Management: While saving is confirmed to work, users have requested the ability to export and reload save files to prevent data loss during browser cache clears.
  • PWA Support: The users have noted a lack of Progressive Web App (PWA) support for Android Firefox.

Community Insights

Community discussion highlights the interest in using LLMs to assist in such ports. One user mentioned using Claude to help build a "discord plays pokemon" project, while another noted that a Gameboy emulator written in Rust was exported to WASM using Opus.

"This isn’t a wasm GBA emulator... This is the game itself compiled to wasm. Even though no official source code was ever published, there was a community based decompilation."

This distinction is critical for technical audiences: the project moves from emulating hardware to executing the game's original logic as native web code.

Sources