Phoenix (aka The Phoenix Emulation Project) is a closed-source 3DO, Atari Jaguar, ColecoVision, Sega Master System and Game Gear emulator created by a long time FreeDO contributor who was unhappy with the "insignificant" progress of 3DO emulation. The PC version of the emulator is currently only available in Russian, but an English patch is available (requires forum registration, you only need the english patch file not the other attachment). Phoenix's cores are separate releases on Android, where they are known as Real3DOPlayer for 3DO, IrataJaguar for Atari Jaguar, NumPadPlayer for ColecoVision, and GearMasterPlayer for Sega Master System and Game Gear. Compatibility is identical across all platforms, according to the author. The 3DO and Jaguar cores require a high-end PC or very high-end phone for full-speed emulation.
You have to add the BIOS and ROMs to the emulator first and then load the game.