Several types of games can be effectively used in email marketing: 1. Quizzes: Simple but engaging, quizzes can help in gathering user preferences and opinions. 2. Puzzles: Puzzles can captivate users and encourage them to spend more time interacting with the email. 3. Spin-to-Win: This type of game can be used to offer discounts or prizes, increasing the likelihood of conversions. 4. Trivia: Trivia games can be educational and entertaining, aligning well with content marketing strategies. 5. Scratch Cards: Digital scratch cards can add a layer of excitement and anticipation, driving higher engagement rates.