Narcissism is mental condition in which a person has a high/inflated sense of their own importance, they want excessive attention and admiration, they have lack of empathy and think they are superior to everyone. There are many subcategories to narcissism, but a person who is narcissistic will usually have troubles with relationships, will exploit, manipulate people for money or any personal gain, which will also give them a sense of excitement. They act as if everything is a game to them and that they need to be one step ahead of everyone to be the best.
Hope this helps!! :)