This study examined the effects of computer games on school performance of high school students in Los Baños, Laguna, Philippines. Allowance, gender, peer group and year level positively affect student's decision to play while time spent on studying, year level, previous grade, number of books and time spent playing computer games are found to be significant in affecting student's performance. Results showed that the probability of a computer gamer to fail is 39%, given the student has more than four siblings, a previous grade of at most 84, lesser teachers, lesser hours on studying, living near a computer shop, and spends more hours playing computer games. Moreover, 60% of the students' daily allowance is spent on playing computer games.