Dreamcast Alternate BIOS (“Real Mode“) with Puyo Puyo Fever

Here is how you use the game Puyo Puyo Fever (2004) for Dreamcast to “unlock“ the hidden 3D BIOS menu on the Sega Dreamcast. After “installing“ the memory card icon in Puyo Puyo Fever options menu, go back to the Dreamcast main menu. As long as the memory card with this newly installed file is plugged in your system, you can toggle between default Dreamcast menu and the 3D “Real Mode“ by pressing START. Enjoy!