Learning media made must meet the eligibility criteria, one of which is effectiveness. The research was aimed to examine the effectiveness of computer-based games as a learning media on the nomenclature of an inorganic compound topic. This research used Plomp design research, which consists of three phases: preliminary phase, design prototype phase, and assessment phase. This research trial was 28 students in X grade at Senior High School 1 Puri Mojokerto used one group pretest and posttest design. The game's effectiveness s is based on the n-gain score from the pretest and posttest results, which data is normalized by Kolmogorov-Smirnov non-parametric test. The results of the n-gain calculation are 71.4% of students in one class have a mod...