This study aims to describe the implementation of the Treasure Hunt English Game in English vocabulary learning and determine the improvement in English vocabulary skills of children aged 4-5 years at KB-TK Kristen Petra. The observed skills included children's ability to recognize simple English vocabulary, understand simple instructions, point to appropriate pictures or objects, match vocabulary with pictures or objects, imitate pronunciation, and independently produce simple English words. This research employed Classroom Action Research based on the Kemmis and McTaggart model, conducted in two cycles. Each cycle consisted of planning, action, observation, and reflection. The participants were 15 children aged 4-5 years, consisting of 9 boys and 6 girls. Data were collected through observation and documentation. The findings showed that the implementation of the Treasure Hunt English Game improved the English vocabulary skills of children. The percentage of achievement increased from 47.22% in the pre-cycle stage to 72.50% in Cycle I, and further increased to 85.28% in Cycle II. Additionally, 13 out of 15 children (86.67%) achieved the expected mastery criteria in Cycle II, exceeding the predetermined success criterion of 75%. This research contributes to the development of active and enjoyable English language learning methods for early childhood.
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