Hyakumonogatari Kaidankai (百物語怪談会 -- A Gathering of One Hundred Supernatural Tales) was a popular game during the Edo period. To play the game, one hundred candles were lit in a room at twilight. The players gathered around taking turns telling kaidan (weird tales). After each tale a single candle was extinguished and the room slowly grew darker and darker. The process was believed to summon a supernatural entity.