Apocryphic Visions has recently posted the second part of his trials tutorial for The King of Fighters XIII. Many people have said that KOF XIII’s trial mode is one of the hardest out there. However, since the game doesn’t penalize you for using extra moves you can add EX moves or moves that cause a juggle state to make the trials vastly easier.
Source: Apocryphic Visions
KOF XIII – How to Cheat the Trials System Part 2