When playing a cooperative game, being aware of your collaborators (where they are playing, what they are doing, the abilities they have, etc.) is essential for achieving the game's goals. This led to the definition of Gamespace Awareness in order to guide in the identification of the awareness needs in the form of a compilation of the awareness elements that a cooperative game should feature. Objective: Gamespace Awareness does not establish how much awareness information players must be provided with. This constitutes the main motivation for this work: to assess the impact of different levels of Gamespace Awareness elements on a cooperative game. Method: A multiplayer action game was developed that supports three different awareness configurations, each one featuring different awareness levels (high, medium and low). The impact of these awareness levels was measured as regards game score, time, players' happiness while playing, enjoyment and perceived usefulness. Several techniques such as subjective surveys and facial expression analysis were used to measure these factors. Results: The analysis of the results shows that the higher the awareness, the better the game score. However, the highest level of player happiness was not achieved with the most awareness-enabled configuration; we found that the players' enjoyment depends not only on their awareness level but also on their expertise level. Finally, the awareness elements related to the present and the future were the most useful, as could be expected in a multiplayer action game. Conclusions: The results showed that the medium level awareness obtained the best results. We therefore concluded that a certain level of awareness is necessary, but that excessive awareness could negatively affect the game experience.