The game has two players - one with a ball, the other the tackler - who try to knock the other one down. The young man, identified in local media as Ryan Satterthwaite, died in hospital on Monday after a game of "run it straight" in the city of Palmerston North. A 19-year-old New Zealander has died of a "serious head injury" sustained in a social media-inspired game of tackle with friends, police said. "While this was an impromptu game among friends, not a planned event, this tragic outcome does highlight the inherent safety concerns with such an activity." "In New Zealand, kids are playing this kind of game every day.