paperchase, hare and hounds; treasure hunt

(transitive with avec) to be on a level playing field with, to be on an equal footing with, to be on equal terms with, to keep pace with, to (be able to) compete with

Alternative spelling of plaine de jeux

(figuratively) to play it straight, to play fair [+ avec (object) = with (someone)]

(ice hockey) face-off

15 puzzle

(chiefly in the plural, figuratively) rule of the game (implied or unspoken principle that governs a facet of behavior, especially one involving strategy)

drinking game

to calm down

(sports) to have the lead, to hold the lead / (figuratively) to call the shots, to call the tune