This study was conducted to investigate the psychometric properties of the Finnish version of the Internet Gaming Disorder Test (IGDT-10), identify the proportion displaying problematic gaming behavior (PGB) among Finnish vocational school students, and characterize the relationships between sociodemographic factors and gaming characteristics predicting PGB in this population. This cross-sectional study involving 773 students (mean age 17.5 years). Socio-demographic and gaming behavior characteristics were established using a web-based survey. A confirmatory factor analysis (CFA) showed that the IGDT-10 test has appropriate psychometric properties. The proportion of students exhibiting PGB based on the DSM-5 cut-off threshold was 1.3%. Regression analysis showed that male gender, preference for gaming on a personal computer, gaming time, poor self-perceived health status, and a preference for the solo and multiplayer online battle arenas (MOBA) game genres related positively to PGB scores. These findings demonstrate the appropriateness of the IGDT-10 test for the assessment of problematic gaming among adults, and support further research on PGB in Finland.