The bodies of the victims, who were 15 and thought to be celebrating one of their birthdays, were found after firefighters put out a blaze in an adjacent room.
Prosecutors said a leaky gas container inside a heater was most likely the cause of the blaze. (Facebook) Karolina Barabas. (Facebook) Amelia Wieczorek.
The 28-year-old suspect was charged with "deliberately creating the danger of a fire in the escape room and with unintentionally causing the death of people in a fire", said Ryszard Gasiorowski, a spokesman for Koszalin district prosecutor, quoted by the Polish PAP news agency.
Autopsies showed the girls - who were reportedly friends from school - died of carbon monoxide inhalation. If convicted, Milosz S could face up to eight years in prison.
Police spokeswoman Monika Kosiec said the fire was in a room near where the girls were celebrating a birthday party.
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In an "escape room" game, the players are locked inside a room or building and must find clues that help them get out. The games are popular with Polish teenagers.
Police chief Jaroslaw Szymczyk said other people had previously posted critical remarks online about the safety of that escape room site, but local officials weren't notified.
Authorities have not yet said what may have caused the fire, but following the tragic incident health and safety checks are being carried out on every escape room in the country.
Poland will close 13 escape room entertainment sites due to safety flaws, Prime Minister Mateusz Morawiecki said on Sunday.
Brudziński then shared his condolences in a tweet, he said: "I want to express my sympathy and regrets to the families of the victims of the fire". He called the deaths of the 15-year-olds an "immense tragedy".