"True and False Orchid Pavilion Preface" is a game based on the historical story of the Tang Dynasty and is decrypted around the Orchid Pavilion Preface. Decryption is the main theme of this game. Players need to understand and connect the plot, character background and game item information of the whole game to successfully carry out the game. In addition, players need to go to a specific place to collect clues according to the prompts of the task system, or have a dialogue with specific characters to understand the specific information of the clues, so as to deduce the detailed address of the clues, and obtain the original Lanting preface by collecting fragments of the Lanting preface. Finally, the original Lanting preface needs to be successfully returned to the monk for debate before passing the game smoothly.