To start playing, make sure you have The Circle Undone expansion. First, set up the game according to the rules in the expansion. Then, use the cards from the Union and Disillusion Mythos Pack to add new challenges and scenarios. As you play, try to keep Arkham from falling into chaos. Be careful not to let the dark forces gain too much control. After each game, keep your cards in a card protector to keep them in good condition. Have fun exploring the dark world of Arkham!