Boardgamegeek https://boardgamegeek.com/boardgameexpansion/336872/between-two-castles-mad-king-ludwig-secrets-soiree
Anglais - The king is throwing a party and inviting all the neighbors! This expansion to Between Two Castles of Mad King Ludwig expands the game up to 8 players with two new room types (activity and secret rooms), a new specialty room type (ballrooms), more bonus cards, and a new throne room.