Boss Noise are a form of Noise. They are blue Noise found in various areas that are generally very powerful. All Boss Noise containing storyline bosses only appear post-game. They are one of the rarer kinds of Noise, and have no part of the main storyline. Some Boss Noise must be erased in order to gain a Secret Report for that day. Beating Boss Noise on a difficulty of Hard or above shows a record of the battle time on the Noise screen. Boss Noise are found in areas that have no reception showing, no matter how much regular Noise Neku erases.