: This is the most unique part. It likely refers to Black Frame Insertion (BFI) , a technique used to reduce motion blur in rhythm games by inserting black frames between game frames. "User-hidden" suggests this feature may be a hidden or experimental setting enabled by the modder. Context for Rhythm Game Enthusiasts
: Users on older iOS versions or those without access to the official App Store may look for "fixed" versions compatible with their specific OS. : This is the most unique part
: Indicates it is optimized for 64-bit processors, which is standard for modern iOS devices (iPhone 5s and newer). : This is the most unique part