A: There is an OMORI GBA demake (a fan project). You can run that on the 3DS via mGBA (install the mGBA .cia ). It plays perfectly, but it only covers the first hour of the game.
: Ensure your 3DS has a custom firmware (CFW) installed, such as Luma3DS. This is necessary for running homebrew applications like FBI. omori 3ds cia install
: Press Home to exit. You will see a "New software has been added" notification. Alternatives for OMORI on 3DS A: There is an OMORI GBA demake (a fan project)