Designing fun games that motivate players requires understanding your audience, experimenting and iterating, and surprising and delighting them. To know your audience, you need to target a specific group of players, understand their needs, wants, tastes, etc., and design for them. Experimentation and iteration involves testing different ideas, prototypes, features, etc., and collecting feedback from the players to refine and improve them. Lastly, surprise and delight by offering unexpected and memorable moments, events, rewards, etc., that create positive emotions and impressions for the player. Fun is a subjective and personal experience of enjoyment and pleasure that the player derives from playing the game. It can be influenced by many factors such as genre, style, theme, mechanics or the player's preferences, mood or expectations. Fun can also be categorized into different types like hard fun, easy fun, serious fun or people fun depending on the player's goals, challenges, emotions or social interactions.