As the essay points out, there are many ways to cheat at Quake - open source just makes them easier to do, in some ways. My favorite trick is copying some of the object's over each other, such as replacing the "invisible" eyeballs with a Shambler. Since the eyes have no animation to them like a Shambleer does, an invisible player appears as a very strange moving Shambler.:) There are lots of others. I don't use them when playing other people; I have more fun designing levels anyway.
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As the essay points out, there are many ways to cheat at Quake - open source just makes them easier to do, in some ways. My favorite trick is copying some of the object's over each other, such as replacing the "invisible" eyeballs with a Shambler. Since the eyes have no animation to them like a Shambleer does, an invisible player appears as a very strange moving Shambler. :) There are lots of others. I don't use them when playing other people; I have more fun designing levels anyway.