Grammar plays an essential role in English language learning process for learning it will help language learners have better understanding in the knowledge of English language and then applying the structure accurately in their language use. It is said that grammar is considered one of the most important content in language learning but seems to be the most boring of all. English teachers have approached the changes in teaching grammar. Especially, prior researches on teaching English grammar through language games have also been examined. Hence, in this paper, the authorswould like to introduce a study that developed language games to reinforce some aspects of English grammar of students. The study was conducted at Thai Nguyen University of Sciences subjecting the 30 non-English major students of the university. The students were given pretest of grammar level before the treatment, then the posttest was administered to the same students after being taught grammar through developed language games. The rmding showed there is significant difference between the pretest and posttest scores of the respondents. Therefore, developed language games are useful for reinforcing students' English grammar, valid to be used for grammar lessons, and are commendable among the students.