The development of digital technology has encouraged the use of interactive learning media in elementary education. However, various digital innovations have not fully demonstrated a consistent pedagogical impact on student learning efficiency and interest, especially when media development emphasizes technical aspects rather than instructional design and outcome-based evaluation. This study aims to develop and evaluate a web-based educational game designed to improve elementary school students' learning efficiency and interest. The study used a design and development research approach, which included needs analysis, design, development, and evaluation stages. The research subjects consisted of 32 fourth-grade elementary school students. Data were collected through learning outcome tests (pre-test and post-test), task completion time measurements, learning interest questionnaires, and classroom observations. Quantitative analysis using a paired-sample t-test showed a significant increase in student learning outcomes after using the educational game (t(31) = 9.27; p < 0.001; d = 1.64) and a significant decrease in task completion time (t(31) = 8.11; p < 0.001; d = 1.43). Students' learning interest scores were in the high category (M = 4.21). These findings indicate that pedagogically designed web-based educational games are capable of simultaneously increasing the efficiency and learning interest of elementary school students.
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