How do I check for when all enemies are destroyed

I want the level to end when all enemies are destroyed. At present I count them down as they are destroyed but this is a less than ideal approach.

What would you recommend?

It's fine that way, You can also use the system expression, Enemy.Count, this will return the number of enemy instances.

If count = 0 end level.

Check this capx.

[attachment=0:3svegws7][/attachment:3svegws7]

(Click enemies to destroy them)

Perfect, many thanks