Versus Missions and Boss Rush are a series of boss battle only missions in Gunvolt Chronicles: Luminous Avenger iX 2. All DLC characters also appear in the form of VS Missions. While VS Missions and Boss Rush for the game's normal bosses are unlocked by clearing the story, those for DLC characters are available from the start.
Each VS Mission cleared unlocks a menu outfit for Kohaku. Clearing Boss Rush unlocks all the normal songs from the first Luminous Avenger iX as jukebox options.
In Hard Mode, The Creator replaces Ypsilon, although the mission name remains unchanged.
In Boss Rush, there is a glitch in the Vespa and Autochrome fights. If either is defeated while Copen in the air, bullit dashing downwards and off the ground will cause the player to lose control of him and the dash's length, potentially sending him into the bottomless pit.