# Best 3DO emulator: Opera (RetroArch core), the Gold Cartridge pick

Page: https://whichemulator.wtf/3do/ · Reference: WEM-3DO-I83R

The Ask API at `GET https://whichemulator.wtf/ask` answers questions from the same data as this page, and it is the only place the setup steps are published. It takes `q` (the question, 3 to 500 characters) and an optional `page` (a local path such as `/3do/`). It returns JSON `{answer, consoles, sources, follow_ups}`, or Markdown when the request sends `Accept: text/markdown`. No key; 30 requests a minute per IP. Guide: https://whichemulator.wtf/skill.md

Panasonic 3DO Interactive Multiplayer, Panasonic, 1993. A licensed format: GoldStar, Sanyo and Creative built 3DO machines too.

## Recommended: Opera (RetroArch core)

whichemulator.wtf calls its recommendation for each system the Gold Cartridge pick. For the 3DO, the Gold Cartridge pick is Opera (RetroArch core).

There is no good, maintained standalone 3DO emulator, so the pick is RetroArch with the Opera core. Opera started as the libretro port of 4DO and is the only 3DO emulator still being worked on, with fixes landing through 2026. It runs most of the library and works wherever RetroArch does. It isn't open source in the strict sense: the code is LGPL, but the FreeDO terms it inherits forbid commercial use.

Runs on Windows · Mac · Linux · Android · iOS. Closed source. Download: https://docs.libretro.com/library/opera/

**Retail BIOS recommended:** Current Opera builds start games with a built-in open boot ROM, but it is new and skips parts of the real BIOS. For the best compatibility, dump the BIOS from your own console (a Panasonic FZ-1 or FZ-10, for example) into RetroArch's system folder. A few Japanese games also need the kanji font ROM.

**One controller:** If a game ignores your input, set Opera's Active Devices option to 1. Emulating several pads at once confuses some games.

## Alternatives

- [Phoenix](http://www.arts-union.ru/node/23) (Windows · Mac · Linux · Android, closed source): Closed-source emulator from a former FreeDO developer, often rated the most compatible for 3DO. The PC interface is in Russian, there have been no updates for years, and the Android version is a separate app called Real3DOPlayer. Worth trying when a game fails in Opera.
- [4DO](https://sourceforge.net/projects/fourdo/) (Windows, closed source): The standalone Windows emulator Opera was forked from. Last updated in 2016 and superseded by Opera, which has the same features and many more fixes. Carries the same non-commercial FreeDO terms.

## RetroArch cores

- Opera: The only 3DO core. Needs a 3DO BIOS; some Japanese games also need the kanji font ROM.

Install it from Online Updater > Core Downloader > The 3DO Company - 3DO (Opera).

## Hardware

- CPU: ARM60 RISC @ 12.5 MHz
- Graphics: Madam accelerator + Clio
- Resolution: 320×240 (60 Hz) / 384×288 (50 Hz)
- Colours: 16-bit palettised or 24-bit
- Sound: Clio DSP, 16-bit stereo @ 44.1 kHz
- Library: ~250 games

## Notes

### Why RetroArch

Every standalone 3DO emulator has stopped. FreeDO never left beta, 4DO's last release was in 2016, and Phoenix hasn't been updated in years. Opera began as the RetroArch port of 4DO and is the one still being worked on, so for 3DO the RetroArch core is the sensible place to start rather than a fallback.

### The licence

Opera's source is public and based on the LGPL, but every core file still carries FreeDO's extra terms, which take precedence: commercial use is forbidden without the original authors' approval. That rules it out as open source under the usual definition, which is why it is marked closed here. 4DO has the same terms.

### About the built-in boot ROM

In October 2026 Opera gained a built-in, open-source boot ROM called opera-boot, which it now selects by default. It can start games without a retail BIOS, but it is brand new and skips parts of what the real BIOS does. If a game won't start, switch the BIOS option to the retail one you dumped from your own console.

## Support the developers

- [Star on GitHub](https://github.com/libretro/opera-libretro)

## Questions the Ask API answers

- [Which 3DO emulator should I use on macOS?](https://whichemulator.wtf/ask?q=Which+3DO+emulator+should+I+use+on+macOS%3F&page=%2F3do%2F&via=page)
- [Which RetroArch core should I use for the 3DO?](https://whichemulator.wtf/ask?q=Which+RetroArch+core+should+I+use+for+the+3DO%3F&page=%2F3do%2F&via=page)
- [Does 3DO emulation need a BIOS?](https://whichemulator.wtf/ask?q=Does+3DO+emulation+need+a+BIOS%3F&page=%2F3do%2F&via=page)