Félix, a 17-year-old boy, receives an invitation on WhatsApp: do you want to play the Blue Whale Game? The one with the 50 challenges? The one where you have to kill yourself at the end? Félix accepts. That is how he meets Elisa. They start completing the challenges together.
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Blue Whale Challenge, also known simply as the Blue Whale, is a social network phenomenon dating from 2016 that is claimed to exist in several countries. It is a "game" reportedly consisting of a series of tasks assigned to players by administrators over a 50-day period, initially innocuous before introducing elements of self-harm and the final challenge requiring the player to commit suicide.