Blue Whale Hoax
Also known as Blue Whale Game, Sinyy Kit Hoax, Razbudi mena v 4:20 Hoax, Tikhiy Dom Hoax, F57 Hoax, F58 Hoax
urban legend about the existence of a game on the Russophonic internet that allegedly incites teenagers to commit suicide
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A drawing of a blue whale like this is usually associated with the challenge.
Blue Whale Challenge (Russian: Си́ний ки́т, romanized: Siniy kit), also known simply as the Blue Whale, is a social network phenomenon, first appeared in Russia in 2013, 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, which are initially innocuous and then introduce elements of self-harm, with the final challenge requiring the player to kill themselves.