In this paper we point out the advantages of CSCL (Computer-Supported Collaborative Learning) and technological media to improve the learning process. In particular, we are interested in using videogames as complement to traditional education. So, our main proposal is intended to introduce collaborative activities into educational videogames maintaining playability as pupils obtain benefits from both activities (play and learn). We have named this proposal as VGSCL (VideoGames-Supported Computer Learning). One of the biggest problems of including collaborative activities into learning process is assessing if collaboration is being made in an efficient way. To do this we are working in a method to detect, analyse and adapt interaction patterns. In this paper we present the first step in this process by proposing a messages classification. This classification is intended to determine which messages are relevant to the study and how important they are to the collaboration process. Also, we give some examples of using this categorization by using the educational videogame with collaborative activities "Leoncio and friends".