Photos: Come Out and Play festival

A "Cruel 2 B Kind" team of at least 30 people walks down Broadway in Manhattan. It was sometimes difficult to distinguish between the groups of tourists and opposing teams.

Winners in each of several different categories in "Cruel 2 B Kind" got glittery hats as prizes.

Social scientist Danah Boyd talked with "Cruel 2 B Kind" designers Jane McGonigal and Ian Bogost at the conclusion of the game on Saturday in New York's Central Park.

GameLab CEO Eric Zimmerman standing with his bike at the conclusion of "Cruel 2 B Kind."

The shelves in game developer Gamelab's Manhattan offices are stocked wth nearly every kind of board game, video game and old computer one could imagine.

Players in game designer Nick Fortugno's "Ghost Engines in the Sky," a live-action role-playing game, studied their clue sheets on Friday.

This dog became a course hazard on the streets of Manhattan during "Manhattan Megaputt," one of many events in the Come out and Play steet games festival, by trying to eat one team's ball.

GameLab CEO and "Manhattan Megaputt" contestant Eric Zimmerman hits his orange golfball while an opponent's yellow ball sits idle.

Players in "Manhattan Story Mashup" studied their cell phones for clues on Saturday.

David Hindman and Evan Drummond perform "Modal Kombat," in which they control the fighters in a video game on-screen by the way they play their guitars.