Count number of objects

Hey,

I'm looking to count how many of a certain object are left on the level so that when the number = zero, the exit will appear.

Any help would be much appreciated.

Use the Sprite.Count expression:

http://www.scirra.com/manual/133/common-expressions

Sorry, but could you tell me where to look? Tat age doesn't appear to say which section it is in. I've tried system, and the object, for both conditions and actions and can't see it anywhere.

It's an expression.

Use the system condition "compare two values" and set one value to Sprite.Count and the other to 0.

Thanks R0j0!