DemoLet's play!
Two of you guess. Everyone else sings a carol or answers a Christmas question together, acting out a secret Challenge the guessers cannot see.
Get it right and ornaments go on the tree. Twelve by Christmas Eve and you win together: the star goes on top.
No account needed.
3 to 10 players. Best with 4 or more.
About 20 minutes, seven rounds on an advent calendar. The guessers have three goes at naming the Challenge. Nobody wins on their own: there is one tree and it is everybody's.