A purposive sampling method was adopted to select college students who were “Glory of Kings” players from six universities or colleges in Zhejiang Province. Inclusion criteria: (1) college students; (2) playing the “Glory of Kings” game for more than 1 year; (3) have participated in the “Glory of Kings” game in the ranking tournament; and (4) informed consent and voluntary participation. Exclusion criteria: (1) college students suspended from school due to physical problems; (2) students who have a medical history of mental illness or psychiatric disorders and who were screened as having mental problems in the students’ general psychological test. The sample size was determined based on the principle of theoretical saturation. Interviews were conducted until reached theoretical saturation—that is, when the 18th participants did not provide new insights, and two more interviews were conducted to verify if new information would emerge. In the end, no new ideas were found to emerge making the sample size appropriate for this study. Among 23 students who were invited to participate, one student refused to participate due to lack of interest, and two persons were unable to participate due to time conflicts. Eventually, 20 college students (13 males and 7 females) were interviewed. Their ages ranged from 18 to 21 years, and their experience in playing the “Glory of Kings” game ranged from 2 to 6 years. The detailed information of participants is shown in Table 1.
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