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The name ‘Blue Whale’ is believed to come from the animals, who beach themselves in an act of ‘suicide’.
Individual participants are assigned a task masters, who gives them an often masochistic task to complete for 49 days.
As well as using a knife or razor to make the shape of a whale on their wrist or leg, players are also urged to watch horror movies all day and to wake themselves at 4.20am.
On the 50th day, ‘players’ are then encouraged to kill themselves.
An online group linked to the fad has thousands of followers on social media.
Game masters are telling girls to carve words or symbols into their bodies for the game called Blue Whale, depicted here with a bloody cut in a separate teenager’s forearm