Hero Core Annihilation, Boss Rush, Hero Forever, and Music options
Successfully complete the game on the Normal or Hard difficulty to unlock the Annihilation, Boss Rush, Hero Forever, and Music options.
HP Scanner option
Successfully complete the game on the Annihilation difficulty to unlock the HP Scanner option.
Bonus maps
Successfully complete the game on the Normal, Hard, or Annihilation difficulty to unlock a map for that mode.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art / Original