The paper focuses on computer games addiction and its prevention. Types of addiction are shown. The relevance of addictive behavior prevention is revealed. Forms of addictive behavior are discussed. Computer games classification is presented. Positive and negative effects of computerization of primary schools are described. RPG - role playing games are analyzed as the most dangerous from the point of view of addiction. Characteristics of gambling addiction beginning (game addiction) among primary school children are considered. Attention to the computer games effect on children’s personality development is paid in the article. Symptoms of computer games addiction are described. Addiction levels are shown. Recommendations concerning addiction prevention are given.