Opis w języku angielskim:
Muster is a card game where players compete to conquer five castles in the medieval kingdom of Muster.
Game is played in turns. On each turn, players start with five cards in their hands and have to perform exactly one action:
- Play a card as a banner: Card is placed under one of the five castles (depending on the colour of the card) on the player's side (players form separate piles). The number of banner icons determine the conquering strength towards that particular castle and must be equal or greater than that of the card directly underneath.
- Play a rainbow wizard: Rainbow wizards are played just like banner cards, but serve as a wild card and don't have to follow the same placement rules.
- Move a rainbow wizard: Move one rainbow wizard card onto another castle's banner pile. Then draw one card from the deck a place it on top of a castle space (with matching colour).
- Play a card on a castle: Place one card from the hand on top of the castle with matching colour.
- Play a rainbow card as a rainbow bridge: Place a rainbow card on any banner pile regardless of the banner icons. Then place a banner card (following the usual rules) on top of the rainbow card.
- Steal a rainbow card: A player can take a rainbow card previously played by their opponent if they can exchange it with a suitable banner card from their hand.
After playing one action, players draw cards to a hand of 5 cards. These can be drawn either from the deck, or the face-up piles on the five castle spaces (not banner piles).
The game ends when the draw deck runs out of cards. Then players compare their strength (number of banner icons) under each castle; the player with the higher value conquers that castle. The player who controls the most castles wins the whole game.