Here's an example:
http://dl.dropbox.com/u/5426011/examples2/snakes.cap
Made in 0.99.96
The sprites have two variables "group" and "num":
"group" can be thought of as the array number the sprite is part of.
"num" can be thought of as the key or index in the array.
So for example to select the third sprite in group (or array) #1 two conditions are needed:
+ Sprite: Value 'group' Equal to 1
+ Sprite: Value 'num' Equal to 3
Is that helpful?