From Garry's Mod
Returns the difficulty level of the game.
TIP: You can use this function in your scripted NPCs or Nextbots to make them harder, however, it is a good idea to lock powerful attacks behind the highest difficulty instead of just increasing the health.
|NOTE||Internally this is tied to the gamerules entity, so you'll have to wait to wait until GM:InitPostEntity is called to return the skill level|
The difficulty level, Easy( 1 ), Normal( 2 ), Hard( 3 ).