The young Russian man behind an online suicide game called “Blue Whale” has been sentenced to three years and four months behind bars, a district court in Russia’s Tyumen region ruled on Monday.

“Philipp Budeikin was found guilty of inciting two girls, 16 and 17, to commit suicide,” the 72.ru online newspaper quoted the judge’s aide Elvira Yakubova as saying.

Budeikin, also known by the moniker “Fox” was detained in November 2016 at his mother’s apartment in the Moscow region.

In May 2017, he pleaded guilty to inciting the suicides of 15 teenagers throughout Russia, but investigators linked him to just two cases.

Budeikin previously said his victims were “biological waste” and that his suicide game was “cleansing society.”