摘要:In the effort to upgrade pupils' vocabulary learning experience, the potential of interactive educational games is increasingly explored as supplementary teaching and learning materials. While the eagerness to integrate mobile technology into English language education is noticeable, there is a lack of evidence on Malaysian English as Second Language (ESL) learners' views of the feasibility of online games in vocabulary learning. This study aims to determine the degree of improvement in pupils' vocabulary performance. The quantitative data was analysed using descriptive and dependent t-test analysis. The cross-sectional survey was adapted from the ACRS-V model. The questionnaire was distributed to Year 5 pupils from a national primary school in Negeri Sembilan who are using the syllabus of The English Language Curriculum for Primary Schools (KSSR). The findings show a moderate level of Satisfaction, Attention, Relevance, Confidence and Volition. In addition, a paired sample t-test indicates a significant improvement in the pupils’ vocabulary scores after using WordWall (WOW) as a vocabulary learning supplementary material. The effect size demonstrated is also larger regarding its effects in behavioural sciences. This study provides important insights as a guide for primary school English teachers in integrating online games as a learning tool for English language learning, especially in developing pupils’ English vocabulary repertoire.