Disastr Blastr Level select
While viewing the map, press Left Analog-stick Left, Left Analog-stick Right, Left Analog-stick Down, X, Left Analog-stick Right, Left Analog-stick Left, Left Analog-stick Up, Y to unlock all levels.
Easy mode
At the title screen, press X, Left Analog-stick Down, Left Analog-stick Up, Y, Left Analog-stick Left, Left Analog-stick Right, X, Y. If you entered the code correctly, you will hear the “objective completed” melody. Press Start to play the game in Easy mode.
Delete saved game files
While viewing the map, hold LB + RB + click Left Analog-stick + Right Analog-stick.
The image featured at the top of this post is ©The Legend of Heroes: Trails of Cold Steel III key art.