V1.9 Update - Tell You Some Secrets

New Content:
1. Added game tutorials, including key tutorials, mechanic tutorials, weapon stats and enemy stats.
2. Adjusted the amount of experience required to level up, and the amount of experience required for players to level up after level 40 has been changed to a fixed and no longer increases.
3. The working hours of the hound are adjusted to 8:00~18:00 (previously 9:00~17:00). Eight, some players are unhappy with your 9-to-5 work, work overtime for me!
4. Fixed some bugs.