Purpose: The objective of this research is to measure Chinese students' progress in gaining new vocabulary in Spanish at the B1 level after using the serious video game Guadalingo. Design/methodology/approach: A group of 30 Chinese students participated in an experiment, in which 16 of them played Guadalingo; the other 14 were used as the control group. The experimental group played five lessons of the video game in a period of 10 days. Before and after the lessons, students were tested on their knowledge of the vocabulary from these units. Findings: Results have shown that the use of Guadalingo helped these students to enhance their knowledge of the target vocabulary by 17.40% after the completion of the missions. Originality/value: Based on our result, the use of video games seems to be a suitable and great support to the foreign language classroom, and the use of Guadalingo could be considered a valuable tool for this purpose.