Traditional teaching methods can sometimes fail to engage students, especially for reading tasks. Game-based learning introduces an element of fun and competition, which can significantly increase students' motivation to read English Extensive Reading books. This study investigates the impact of game-based learning on English as a Foreign Language (EFL) students' reading comprehension by employing pre-test and post-test assessments. The primary objective is to measure the changes in students' reading comprehension ability after participating in game-based learning activities during reading classes. This research was conducted among Mongolian high school students during one academic year of Extensive reading with game-based activities. Preliminary results have indicated a significant enhancement in students' reading comprehension, suggesting that game-based learning can effectively support literacy development in EFL education. The research findings are intended for EFL educators seeking to enhance English reading comprehension through effective teaching methods.