Playground tag, with everyone who's online right now.

The oldest game there is, played with whoever else has the page open. Type your name and you drop straight into the arena. One player is It, and It runs faster than everybody else — so when they come for you, you really have to move. Get caught and you're It: you lose a few points, and the player who tagged you gains some. Duck behind the blocks, cut the corners, and watch the scoreboard.

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