Real Survival, known in Japan as the "Real Survival Mode" (リアル・サバイバル・モード Riaru sabaibaru mōdo ), is a bonus gameplay mode in REmake. It is unlocked after completing "Once again...", which is itself unlocked after completing the game the first time. In this mode, the game is set to Hard difficulty, the item boxes are no longer interconnected, and auto-aim is turned off.
This mode is a reference to prototype versions of the original 1996 game. Originally, the item boxes were not intended to be interconnected with one another, but this was changed later in development due to criticism from testers.