By observing the cards that the guests are about to use, make corresponding countermeasures and choose the right cards to compete with them. At the beginning of the battle, the dice in the selected card will determine the success or failure of the battle. However, the number of dice is not entirely determined by luck. Some unexpected factors will change the outcome of the dice, each with its own advantages and disadvantages.

The battle of the library is not only to kill the enemy, but also to sublimate the emotion to the extreme. As the war intensifies, the mood of ministers and guests will rise step by step. The secretary's emotional change will have a positive effect or a huge negative effect. The tension of the guests will gradually increase, and the difficulty of fighting will also increase, but at the same time, there will be opportunities to obtain rarer books.