two (can|could) play (that|this|the) game

used to show one's confidence in dealing with another person's behavior and using it to their disadvantage

The origin of the idiom "two can play that game" can be traced back to the idea of reciprocity and competition. The phrase likely evolved from the concept of responding to someone's actions in a similar manner, especially in situations involving rivalry or conflict. It reflects the notion that if one person initiates a particular course of action, another person can adopt a similar approach to counteract or compete effectively. It is often used when someone observes another person engaging in a particular strategy, behavior, or action, and they want to convey their readiness and ability to respond in a similar manner.

When Sarah realized her coworker was spreading rumors about her, she decided that two could play that game and started sharing some of her own about him.
After being constantly challenged by his rival, Mark finally decided that two could play this game and started competing even harder.
When Laura discovered that her friend was trying to outdo her in their exercise routine, she decided that two could have played that game but chose to maintain a supportive friendship instead.
During the negotiations, both parties recognized the other's tactics and thought, "Two could have played this game," leading to a more cooperative discussion.
When Sarah realized her coworker was spreading rumors about her, she decided that two could play the game and started sharing her own positive achievements.