As eye tracking studies are becoming more common, eye behavior is being explored in different scientific fields as it can be analyzed to detect changes in the mental state of users. In this way the development of new products or technologies could include eye tracking as an objective way of obtaining feedback from users. This paper presents an experiment that compares the eye behavior of users' blinks during interaction with two different levels of difficulty in a video game. The results of the experiment show that the participants' blink rate per minute was significantly reduced, according to the state-of-the-art normal blink behavior, during the two tasks. However, it is also shown that there is no significant difference between the samples taken, which is attributable to the fact that interaction with video games, in any difficulty, represents high cognitive load.