Mysterious snake in Blackwater, click on the brave Ahan on the head of the snake to finish the poker endgame with Ahan. After the challenge is successful, you can complete the task of exploring the spirit of No.3 staring at the black water snake. The specific steps are as follows:

1. Open the empty mountain map and click the arrow position above.

2. Then click Brave Ahan on the snake head.

3. Play poker with Han.

4. After the challenge is successful, No.3 can complete the task of gazing at the mysterious snake of Blackwater.