Tutorials
Antlion Rush
This tutorial will show you how to make antlions spawn and attack in a Single Player map.
Start with a map that is suitable for this tutorial, like a defense map for example. Now you want your antlions to attack at a specific point. Place the entity info_node on the ground. This is where the antlions will walk. Then create an npc_antlion where you want the antlions to start. Then place info_nodes where you want them to walk, like the picture below.
Alot of info_nodes will be needed for the antlions to have alot of routes to take. If you want them to take a specific route, just place them where you want them to walk. Now if you want your antlions to fly over a wall or something like that, you should make a info_node_air, and make it up the air (near the wall) and make one a little closer to the wall and a bit lower too. Then make a normal info_node where you want them to land. Somewhat like this.
And there you are now done. Note that this can be used for all the NPC's available. And you should also note that you have to make many info_nodes for them to run in different paths.
SzaFtO