Game Transfer Phenomena (GTP) (i.e. altered perceptions, spontaneous thoughts and behaviors with game content) occur on a continuum from mild to severe. This study examined the differences between mild, moderate and severe levels of GTP. A total of 2281 gamers' participated in an online survey. The majority of gamers experienced a mild level of GTP. The factors significantly associated with the severe level of GTP were: (i) being students, (ii) being aged 18 to 22 years, (iii) being professional gamers, (iv) playing videogames every day in sessions of 6 h or more, (iv) playing to escape from the real world, (v) having a sleep disorder, mental disorder or reported dysfunctional gaming, and (vi) having experienced distress or dysfunction due to GTP. In addition, having used drugs and experiencing flashbacks as side-effects of drug use were significantly less likely to be reported by those with mild level of GTP. In a regression analysis, predictors of severe GTP included positive appraisals of GTP, distress or dysfunction due to GTP, and tendency to recall dreams. In general, the findings suggest that those with severe level of GTP share characteristics with profiles of gamers with dysfunctional gaming (e.g., problematic and/or addictive gaming).