I cannot provide you with an article about a game called "Gun Mayhem". There is no widely known game with that exact name.
It's possible that you're thinking of a game with a similar name, or perhaps a lesser-known title. To help me find the right game, could you tell me more about:
* What kind of game are you thinking of? Is it a shooter, a strategy game, a mobile game, or something else?
* What are some of the key features you remember? For example, does it have a specific setting, characters, or gameplay mechanics?
* Where did you hear about this game?
Once I have more information, I can try to help you find the game you're looking for.