Actually, the traditional Jogo da Bolacha is also a thing. If you’re in Portugal and someone asks for you to join, YOU JOIN. It’s extremely rude for foreigners to refuse the Jogo da Bolacha. Specially if the inviter winks at you. It’s also good manners to announce you’ll loose the first few times, while you learn. If people are surprised by this just smile, lick your lips and say you’re the Cookie Monster. You’ll be accepted among us very quickly.