How do I control the Z order of created objects?

Hey there.

I'm currently developing a prototype for a tower defense game similar to Plants vs Zombies. Right now, tower placement and deletion works, as well as a basic shooter unit. However, I can't seem to figure out how to control the Z order of the units I create on the board.

As expected, more recent units stay on top.

I tried making the Z order be equivalent to their Y position on the board, but I can't seem to manipulate it further than moving higher or lower. None of the methods I tried to use worked. How could I make it so that higher units always stay on the back without a large amount of unnecessary layers for each lane? (The board may be much larger than this in later stages)

Thanks in advance.

EDIT: Oh yes, here's the prototype's .capx with my original attempt. The hitbox object is due to the unit's actual collision polygon being the tile, thus not being able to check for sprite excess.

The solution is so simple, just use for each (ordered) based on it's Y position

I edited yours capx

Oh wow! That's a pretty clever use of the 'for each' condition. Didn't notice you could pick an order for it.

Thanks for the help, it works perfectly! =)