The Artificial Intelligence (AI) applied in electronic games is known as Game AI (Game Artificial Intelligence), and its main purpose is to create a behavior which seems intelligent, due to a scenario with multiple choices. This should be similar to the human-being behavior with personality, making mistakes and be able to provide different levels of difficulty to the employer, in order to add experience and immersion in the game and improve its gameplay. The present paper presents the use of ANN (Artificial Neural Networks) in NPC (Non-Player Character) decision-making process in RPG (Role-Playing Games) electronic games. It mainly focus on the making of decision of attacking or not a certain opponent by analyzing the NPC and its opponent internal state.