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Yee N (2006) Motivations for play in online games. Cyberpsychology & Behavior 9(6), 772-775. Young K (1998a) Caught in the net. John Wiley & Sons, New York. Young K (1998b) Internet addiction: The emergence of a new clinical disorder. CyberPsychology & Behavior 1(3), 237-244. Young K (2010a) Internet addiction over the decade: A personal look back. World Psychiatry 9(2), 91-91. Young K (2010b) Understanding gaming addiction. Center for Internet Addiction Recovery, Bradford, PA pp 1-30. Appendix A: Measurement Instrument Game Playing longest playing time □ <5 Hr., □ 5~10 Hr., □ 10~20 Hr., □ 20~30 Hr., □ >30 Hr. Playtime per week Game playing occupies ___ % of my free time Addiction (1 = strongly disagree; 7 = strongly agree) A1* My social life has sometimes suffered because of my online game playing. A2 Playing online games has sometimes interfered with my work or study. A3 When I am not playing online games I often feel restless. A4 I have made unsuccessful attempts to reduce the time I spend playing online games. A5 Arguments have sometimes arisen at home because of the time I spend on online games. A6 I often fail to get enough sleep because of playing online games. A7 I often miss meals because of playing online games. Need for Advancement (1 = strongly disagree; 7 = strongly agree) ADV1 It is important for me to level up my game character as fast as possible. ADV2 It is important for me to acquiring rare items that most players will never have. ADV3 It is important for me to become powerful in the game. ADV4 It is important for me to accumulating resources, items, or money in the game