Ratchet & Clank: Up Your Arsenal

Ratchet & Clank: Up Your Arsenal is the third game in the Ratchet & Clank series.

Unused Music
The files that when pieced together make this unused track are named 'rc3_l31_boss'. Under the same naming scheme, the 'l31' prefix is for the Insomniac Museum, but the only boss there is that of the 'cut' Vid-Comic, whose fight uses the same background music as the level itself.

The purpose of the track is revealed by the game's demo, however. In its version of the first Vid-Comic, the Insomniac Museum background music is used as the stage theme and the unused track is used for the boss. In the final game these are replaced for whatever reason with two different tracks. Given the superfluous (but welcome) nature of the Insomniac Museum, its music was likely chosen due to its unused nature, without regard to the track's original intended purpose.

Unused Areas
GqVUKb7tLK0 In the Insomniac Museum, there exists a room which can only be accessed by moonjumping to a specific part of the roof and falling through or by using a glitch. It is a small room with a lone jump pad and a narrow maze-like corridor which ends with a floor that instantly kills Ratchet if he walks over it.