Like "Hunger Games" but digital and with cuter outfits, the uneven thriller "Nerve" pits teen against teen in a daredevil online game - "like Truth or Dare," we're told, "minus the truth." Staten Island high-school senior Vee (Emma Roberts), frustrated when her best friend Sydney (Emily Meade) calls her a "watcher," signs up to play Nerve, the game all her friends are obsessively following.