Castles of Mad King Ludwig

The original supports 1 to 4 players. Multiplayer setup uses 22/33/44 Room cards for 2/3/4 players and markets of 5/6/7 rooms. Reduce room and corridor supplies for the player count and reveal one King's Favor per player.

Each player starts with a Foyer, 15000 Marks, and 3 Bonus cards. Beginning with the Master Builder, each returns 1 card to the bottom of the deck. The Master Builder starts at 0 points; subsequent clockwise players start on successive score spaces.

Each round, the Master Builder draws Room cards for vacant market spaces, adds rooms of those sizes, then allocates all rooms to prices, at most one room per price. The 2000 space is unused with two players. Prices may be rearranged even without new rooms.

Starting left of the Master Builder, each player buys one market room, buys a Hallway or Stairs for 3000 Marks, or passes to receive 5000 from the bank. Other players pay the Master Builder; the Master Builder acts last and pays the bank for their own purchase.

At round end, each unsold market room receives another 1000 from the bank. Its buyer keeps all accumulated money and may use it to pay for that purchase. Purchased rooms must immediately be legally placed and scored.

At least one new entrance must connect to an existing room entrance. Tiles cannot overlap and may rotate in 90-degree steps. Other entrances may face walls, but the castle must retain at least one entrance leading to the actual outside edge, not an enclosed courtyard. You cannot buy a room you cannot legally place.

Downstairs rooms and Downstairs Hallways connect to the main floor only through Stairs, never directly through an upstairs entrance. Downstairs rooms can connect to further downstairs rooms. An Outdoor room's fenced edge cannot adjoin another room, nor can a new room be placed against an existing fenced edge.

Placement scoring first applies the new room's upper-left points and central-icon conditions, then updates directly connected existing rooms, adjacent Activity-room penalties, and matching-type bonuses from Downstairs rooms throughout the castle. Entrance connections and wall adjacency are distinct conditions.

A room completes only when every entrance connects to another room entrance; a doorway facing a wall prevents completion. Living rooms rescore themselves, Activity rooms add 5 points, Outdoor rooms give 10000, Utility rooms draw 2 Bonus cards and keep 1, Food rooms give an immediate extra turn, and every second completed Downstairs room allows another type's completion reward.

Finish the entire round in which the Room-card deck runs out. If the final refill is short, reshuffle Room cards as instructed to fill the market. Add King's Favors, private Bonus cards, 1 point per 10000 cash, and 2 points per castle room matching a depleted supply stack. Highest score wins; tied players compare total castle square footage.