keys.txt is a hidden screamer on the Russian forum Games.gen. This forum has a hidden page that contains game keys, but only for Counter-Strike: Global Offensive and Skyrim. However, clicking in one of the .txt files or folders will result in a flashing picture of Jeff the Killer along with an extremely loud screech.
WARNING: The following website contains a screamer with flashing lights.
- games-gen.com/giveaways/ - Safe version.