Research has indicated that most of the people usually in developed countries spend more time in computer gaming. It has become so popular, that now research is growing to find the effects of game on human nature, outlining the negative consequences of excessive gaming and attached risk factors. Particularly no studies have been performed by taking into consideration the flow and addiction altogether. This paper reviewed studies and comparative evaluation of recent techniques used in detection of addiction and flow in computer game playing. The evaluation indicates that the techniques have their own strengths and weaknesses. The criteria of addiction and flow defined by the psychologists and the studies to develop the indicators have also been considered. But recently some experiments involved the use of EEG (electroencephalography), fMRI (Functional magnetic resonance imaging) and PET (Positron Emission Tomography) for psychophysiological research in this area.