Unfortunately, this mode has been removed in this new version of the game, meaning GTA San Andreas Definitive Edition does not have co-op or multiplayer of any kind. If players go to the spot where the co-op activation icon is supposed to be, they'll find nothing. This may not be all that surprising since the mobile port of San Andreas removed co-op as well, but it's still likely disappointing to some players who were hoping for some nostalgic co-op action.