El Clásico refers to the football (soccer) match played between two of the most successful and popular teams in the world, Real Madrid and Barcelona, who are based in Spain, It is one of the most highly anticipated and watched matches in the sport, and has a long and storied history,
There are many video games that allow you to play as Real Madrid or Barcelona, and some of them might feature a mode where you can play an El Clásico match, However, without more specific information about which game you are referring to, I cannot provide a detailed explanation of how to play the El Clásico mode, Can you please provide more information about the specific game you are referring to?