<p>Museums are places for informal education. The Observatory and Science Experience Centre in Eger, Hungary, has been using different entertaining methods for this purpose for some time. Recently, however, curators identified the need for a new game to enhance visitors’ environmental attitudes and awareness. They decided to address this issue using an escape game. This game type has the advantage of being a popular form of entertainment for both younger and older people, and even for whole families – a good fit for the Observatory’s visitor structure. Research has shown that escape games lead to a promising, albeit statistically not significant increase in players’ environmental attitude scores. In light of these considerations, the aim of the study presented here was to examine whether the escape game designed for the Observatory’s purposes would be effective in improving visitors’ environmental attitudes. To answer this question, the author used the environmental emotion sub-scale (EESS) from the “Environmental Attitude” questionnaire developed in 2019 by Naim Uzun, Kenneth L. Gilbertson, Ozgul Keles and İlkka Ratinen. The 131 participant players in the study sample (83 female, 48 male) voluntarily filled out the survey form both before and after playing the game. Both analyses of the results, one applying the Wilcoxon signed-rank test to the attitude scores and the other using the rating scale model (RSM) with paired sample <i>t</i>-test, showed that the players’ environmental attitudes had indeed improved significantly (<i>p</i> &lt; .001).</p>