The effectiveness and efficiency of using Object Based Game (OBG) in teaching and learning English language morphemes was investigated. Two research questions guided the study. The study was a pretest-post-test non equivalent control group design which employed a sample of 200 senior secondary two (SS2) English language students drawn from 20 co-educational schools within Lagos Island and Eti-Osa educational zone of Lagos State, Nigeria. Morphemes Object Based Game (MOBG) and English Language Achievement Test (ELAT) were constructed and validated with coefficient of internal consistency of .89 and .86 respectively. Mean standard deviation and analysis of covariance (ANCOVA) were used to answer research questions. The findings from the results showed that: MOBG was found to be significantly more effective in facilitating teaching morphemes (in English language vocabulary building) than conventional (traditional) method of teaching. Non significant difference existed between the performance of male and female students taught with MOBG and conventional method. Suggestion was made by encouraging teachers in using game to teach
Keywords: Instruction And Gender, Learning, Morphemes, Objects Based Game
