This study described the development of a culturally adapted video version of Strange Stories test as a measure of advanced theory of mind for youths in an Asian country (i.e. Singapore), the Y-ToM, and to provide preliminary psychometric properties. Participants were 170 youths (82 male, 88 female) aged from 13 to 16 years old (M = 14.77, SD = 1.16) in Singapore. The youths completed the Y-ToM, an abbreviated IQ test and the Happé's Strange Stories in a counterbalanced order while their parents completed the Child Behavior Checklist (CBCL). A two-factor structure consisting of social and physical subscales was suggested. Concurrent, convergent, divergent and diagnostic validity of the Y-ToM was examined. Internal consistency of the Y-ToM social subscale was acceptable though it was not satisfactory for the Y-ToM physical subscale. Inter-rater reliability was good while test-retest reliability was lower.