PlaytestLet's play!
One person guesses. Everyone else answers a Christmas question or sings a carol, together, in a style the guesser cannot see.
Get it right and an ornament goes on the tree. Twelve by Christmas Day earns the star. You are all on the same side.
No account needed.
Best with 3 to 8 players. You need at least two: somebody has to perform.
Twenty-four days on an advent calendar, one turn each. The guesser has three goes at naming the Challenge. Nobody wins and nobody loses: you all end up with one tree.