Facts on choking game that killed boy, 13

ABOUT THE CHOKING GAME:

WHAT IS IT

- The "choking game" requires the person to cut off oxygen to the brain, for a natural high

- Called the "good boys' game" because it does not involve taking alcohol or drugs

WHO PLAYS IT

- It's a craze with teens online and is played alone or with others

- Sometimes they film themselves and share it online

WHY NOW

- Asphyxial games are not a new phenomenon but this game has gained popularity with youngsters in the past two years

- Previous cases in the UK include:

Jack Pickles, 14, found in his bedroom by his mother in West Yorkshire

Karnel Haughton, 12, in Birmingham, also found in his bedroom passed out.