I haven't played many online games, mainly World of Tanks, but Halloween and Christmas were the best times in that game. It may be stupid, but nothing made me feel Christmas as much, as firing up that game at the beginning of December, seeing a large Christmas tree in the main menu and hearing the sounds of a Christmas fare.

Dead by Daylight is funniest. Itβs already a game about terrifying horror, but then for Halloween they add a lot of silly spooky pumpkin-related event deco and mechanics.
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