How do you make a level end when there are no enemy's left in game maker 8 pro?

I don't know much about Game Maker, tried to use it, but i was ten at the time and failed miserably ._.

Well, from my short experience from other game making tools (game factory, etc.), you could make each enemy adds +1 to a counter when the player kills him, and make the counter end the level when it reaches the number of present enemies.

Example: Imagine a level has 8 enemies. Each one you kill adds +1 to a counter, let's name it DeathCount. DeathCount starts at 0. With each enemy you kill, DeathCount goes up by 1. When DeathCount reaches 8, which is the total number of enemies in the level, it triggers an event that makes the level end.

Don't know if this helps, as i have no experience with GM, but at least i tried :)