Secret rooms aallow you to change costumes and equip items/ weapons that you unlocked in the game. There are two secret rooms in the following locations: Room #1: The first door on the left after you saw a black figure walking away in the 1st chapter after you start. Room #2: At the start of Chapter 6, look around for a wrecked red car. Next to that car is a trapdoor to bunker which is a secret room. This room allows you to get back the items/ weapons you lost after the train crash.