Source: [3] An Analysis of Wallhack Cheating in CrossFire, Proceedings of the 2017 IEEE International Conference on Computer and Information Technology (CIT).
This paper provides an in-depth analysis of wallhack cheating in CrossFire, focusing on the game mechanics and cheat methods. The author discusses the impact of wallhacks on the game's balance and fairness.
These papers should provide a good starting point for your research on CrossFire wallhacks. Keep in mind that the field of cheat detection and prevention is constantly evolving, and new research may have been published since these papers.
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