2. The second book: enter the maze at the upper right of the narrow street and you can find it in the red box.
3, the third book: click on the maze in the upper right corner of the night spirit hall, and complete the decryption to get it.
4. Book 4: Click on the island in the lower left corner of the snake heart and find it.
5. The fifth book: In the maze at the top left of the snake heart, it can be obtained after decryption.