Encouraged by our previous experience promoting the active learning of disciplines related to language processing by means of specialized tools [14], we envisioned a simulation environment in which students could resolve the exercises and obtain feedback on their successes and their mistakes. Taking into account the highly motivating component of videogames when applied to teaching and learning [8], we decided to use videogames in which the missions of the student were directly related to the solutions of the language processing exercises. The result was a system called Evaluators, which is presented in this article.