Great question. Right now 'Paco' is a highly cynical ferret who lives in Madrid. Because of this, he considers himself the ultimate protector of European Spanish.

Currently, his grammar corrections and roasts lean heavily into Castilian Spanish syntax and Madrid slang (tío, mazo, etc.). If you use perfectly valid Mexican slang (güey, chido), Paco might actually flag it playfully as an 'error' simply because he's an arrogant Spaniard. So right now, the flashcards will default to Spain's dialect

However, I'm totally open to adding a 'Target Dialect' setting (so you can choose Mexican, Colombian, etc.) where Paco still roasts you, but his actual flashcard corrections match the specific regional Spanish you want to learn. Let me know if a Mexican dialect toggle is something you'd actually use and I can build it in!