The killing and fighting behavior in games is defiled mental karma

Disciple Ru She said: I used to think that killing and fighting in games were all fake and did not count as killing karma. But after studying Buddhism in depth, I felt that as long as hatred and the intention to kill arise, it goes against the Buddha's teachings and is impure and contrary to the Dharma. After reading the Sutra on the Precepts of the Five Precepts, I learned that even killing an imagined insect constitutes a violation of the precepts. A practitioner should remain constantly alert to all greed and evil thoughts arising in the mind within worldly phenomena, and only by striving to stay away from them can one possibly subdue them, until they are cultivated and severed. Going from learning the precepts to upholding the precepts is truly important.

Ru She is right. Fictitious fighting and killing in games is also a form of the mind of hatred; it is also indulging in and perfuming the affliction of hatred, and is likewise defilement and evil karma. Regardless of whether the matter exists, whether it truly exists or falsely exists, the moment the mind stirs and a thought moves, it is mental karma, it is afflictive defilement, it is a violation of the precepts—just as Kṣitigarbha Bodhisattva said, the arising of every thought and stirring of every mind of sentient beings is sin. Those who develop games and gambling only want to exploit human psychology to make money, without considering whether they are indulging and perfuming humanity's afflictions of greed, hatred, and delusion. Those who play the games cannot consider this level either; they simply indulge themselves and derive pleasure from it. Not only does the secular world exploit sentient beings' greed for personal gain, but those with ulterior motives within Buddhism likewise seek private benefit, exploiting sentient beings' greedy psychology—knowing what sentient beings want and like, they give them exactly that. Once sentient beings have tasted the sweetness, they will desperately protect and support such people, doing every kind of unwholesome deed without being aware of it themselves.

Everyone regards the five precepts as the precepts, but in fact these are all worldly dharmas, the conduct of virtuous and noble persons; they are cultivation, character, and virtue, which everyone should do very well. Those who wish to be reborn as humans in the next life, or even wish to be reborn as humans life after life, must constantly and everywhere examine their bodily, verbal, and mental actions, and must not act recklessly. Attaining a human body is conditional. Can you yourself satisfy these conditions? Is there evil karma obstructing your attainment of a human body?