他们不应该背对着你。

Objectives

使用潜行者取胜次。

Tiers

1. 5 : 10 objectives completed
2. 5 : 25 objectives completed
3. 5 : 50 objectives completed
4. 10 : 100 objectives completed
5. 10 : 150 objectives completed
6. 10 : 200 objectives completed