I call it the Silent Village
There are only 8-12 players max, they start in a pre-built village (roughly 5x5 chunk) that has houses, town hall, and farms at the start. Around the village are plains, forests, and lakes. The village has basic resources but not enough to sustain all players.
Each of the players would have specific roles that has responsibilities and restrictions, farmer, blacksmith, miner, guards, fisher, lumberjack, trader, builder.
Players would have to stay within village borders, as in there would be a world border outside the village.
The goal is to survive for 15 in-game days by working together without communication. The village should be fully functional by the end of the 15 days. There would also be mobs spawned by the observers every few days, with the last day an intense wave of mobs enter.
The players can only communicate by using body language, place/drop items in certain locations, or using signs with limited text.
if a player dies they would become a ghost for the rest of the day, lose their items, and mobs would increase in amount for the next wave.