Each gate rewards you with the corresponding Secret Report.
To unlock these reports, you must complete the —special combat challenges that appear in various worlds after completing the main story. Kingdom-Hearts-III-TRNT.rar
The Secret Reports are a collection of 13 journal entries found in the endgame. They offer deep insight into the Replica Program , the motivations of key characters like Xehanort , and the events leading up to the final Keyblade War. Each gate rewards you with the corresponding Secret Report