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Developer(s) johnnydude et al.
Latest version
Active No (main branch)
Yes (libretro core)
Platform(s) Windows
Emulates 3DO
Website FourDO.com
GitHub (libretro)
Support ($) PayPal
License GNU GPLv2

4DO is Panasonic 3DO Interactive Multiplayer Emulator for the Windows platform.

Opera (aka 4DO) is an open-source, low-level emulator for the 3DO game console games and a fork of 4DO - 3DO Emulator.

FourDO aka 4DO, the predecessor of Opera, was initially developed as a standalone 3DO emulator for Windows based on the opensourced code of the FreeDO - the first emulator for this console.

4DO libretro core for RetroArch was renamed to Opera to differentiate it from the PC emulator version.


Windows Latest Windows version
from FourDO.com
Windows Latest releases
on SourceForge


3DO BIOS file for the emulator is needed before you can load the game isos.

Guides and info[edit]