1. Interesting guide.

2. Don't count on words to do narrative.

(Balance the gap of communication between players and the plot.)

3. Pinpoint the player's goal but don't tell them how to achieve it.

4. Teach new content continuously.

(Learn - Play - Challenge - Surprise)

5. Surprise players and let them leave their comfort zone.

6. Let players see how they influence the world.

7. Provide risk-reward play style.

8. Reuse the resource effectively.

(Modular / BI-Directional / NON-Linear)

9. Create emotion through the environment.

10. Driven by mechanism.

From: https://gameinstitute.qq.com/community/detail/123752