# Wario Land 4: rebuilding US/EU and Japanese GBA ROMs

> Wario Land 4 is an unfinished GBA decompilation that builds US/EU and Japanese ROM versions from source and assets extracted from the user's base ROM. Its build uses agbcc, ARM binutils and Python tooling, and reports a checksum result for the output.

- Type: Case study
- Targets: Game
- Category: Independent reconstruction cases
- Relationship: Independent reconstruction project
- Sources reviewed: 2026-11-06
- Added to the catalog: 2026-11-09
- Original resource: <https://github.com/lilDavid/warioland4>
- Primary source: <https://github.com/lilDavid/warioland4/blob/abb7800a8d8fa6d7f7f003627893e06bc2879329/README.md>
- Catalog page: <https://awesomerea.org/resources/wario-land-4-decomp-case/>
- Record JSON: <https://awesomerea.org/resources/wario-land-4-decomp-case/record.json>
- Chinese version: [简体中文](https://awesomerea.org/zh/resources/wario-land-4-decomp-case/index.md)

## Requirements & limits

- **Prerequisites:** Provide the corresponding Wario Land 4 base ROM; the US build expects baserom_us.gba.
- **Prerequisites:** Install binutils-arm-none-eabi, clang-format and Python 3, and initialize the agbcc submodule.
- **Limits:** The decompilation is work in progress.
- **License:** MIT License.

## Primary sources

1. <https://github.com/lilDavid/warioland4/blob/abb7800a8d8fa6d7f7f003627893e06bc2879329/README.md>
2. <https://github.com/lilDavid/warioland4/blob/abb7800a8d8fa6d7f7f003627893e06bc2879329/Makefile>
3. <https://github.com/lilDavid/warioland4/blob/abb7800a8d8fa6d7f7f003627893e06bc2879329/LICENSE>

## More in Games

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- [WCW Nitro: a checksum-checked PlayStation decompilation](https://awesomerea.org/resources/wcw-nitro-decomp-case/index.md) · Case study
- [Whippy: matching decompilation of Kirby's Return to Dream Land](https://awesomerea.org/resources/whippy-kirby-return-to-dream-land-case/index.md) · Case study
- [wii-ipl: a decompilation of the Wii Menu (System Menu 4.3)](https://awesomerea.org/resources/wii-menu-ipl-decomp-case/index.md) · Case study
- [Winning Eleven 3 Final Ver.: a matching PlayStation reconstruction](https://awesomerea.org/resources/winning-eleven-3-final-ver-case/index.md) · Case study
- [Wizardry 8 decompilation: reconstructing the Windows game and libraries](https://awesomerea.org/resources/wizardry-8-decomp-case/index.md) · Case study

## About this entry

The description was reviewed against primary sources.
Original editorial content: MIT. Linked projects, papers and assets retain their own rights and licenses.