Description of the film S.D.Death to Soviet children.

A new reality show is launched on television called Pioneer Camp. Following the casting, five boys and five girls, headed by young TV host Alice Ten, go to an abandoned pioneer camp of Soviet times. According to the rules, each week one of the participants must leave the show and return home. The last person to stay on the project will receive the main prize: one million rubles. But suddenly the rules of the game change: an invisible observer announces that now the prize for the winner will not be money, but his own life. The obsessive maniac, hiding his face behind the mask, goes on a bloody hunt for the participants of the reality show. The children's horror stories he once listened to in the pioneer camp come to life and become the plot of his own murders.
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Is the horse’s mask unknown?