Two can play this game

two can play (at) this game

If one person does something (often something deceptive, devious, or harmful), so can another. This phrase typically prefaces an act of retaliation. Did she really start a rumor about me? Well, two can play this game—I'll make sure the whole school is talking about her by tomorrow morning! Stu's been getting here early to impress the boss, so I'll just start coming in at 6 AM. You see? Two can play at this game!
See also: can, game, play, this, two
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.

Two can play (at) this game (as well as one).

Fig. Both competitors—not just one—can compete in this manner or with this strategy. (See also a game that two can play.) You are not the only one who knows how to cheat and lie. Two can play this game.
See also: can, game, play, this, two
McGraw-Hill Dictionary of American Idioms and Phrasal Verbs. © 2002 by The McGraw-Hill Companies, Inc.
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