This study sought to determine the effect of simulation-games environment on students' achievement in attitudes to mathematics in secondary school. Data was collected from a sample of 147 students in senior secondary school in Osun-State, Nigeria. t-test and analysis of variance was used to analyze the data collected for the study. The finding reveals that students' poor academic achievement in mathematics is partly due to the method of teaching used. Also, the findings revealed that, the use of simulation-games environment led to improve achievement and positive attitude towards mathematics. The study conclude that teachers' use of stimulating teaching methods would go a long way in sustaining and motivating students interest in learning mathematics.