We include issues related too security in this category.
Security plays an important role in game play. It ensures that untrusted clients does not intrude into game.
Untrusted players can become threat to security of game. Players often use cheat codes to bypass the levels of game which hampers the game dignity.
Developers should ensure that there is proper channel of authentication for players that checks for insecure passwords, multiple logins, sniffed passwords and so on. Also, developers should follow all the heuristics related to security issues in games [1].
Consider an online multiplayer game, where a player tries to login through multiple devices at the same time to increase the his odds of winning the game.
[1] J. Yan and H.-J. Choi. Security issues in online games. The Electronic Library, 2002.