How do I make an upper Sprite cover a lower Sprites?

I am trying to make a top Z order Sprite cover lower Sprites so they are no longer selectable with the mouse or touch.

Basically, I have blocks that are normally selectable that I want to make them impossible to select when a specific Sprite is above them visually. Whether the Sprite is a transparent mask or a solid object.

It seems like using the Z order is the most obvious solution, but I am open to suggestions.

Or with an instance variable?

I'm not sure I understand what you mean. Is that a question or a suggestion?

On click, check if the object is overlapped, if so ignore the click.

Great! I am very new to this so I will try experimenting with Booleans.

I am having trouble understanding the Booleans and getting them to function as I would like.

Also, where do I place them? As a condition or an action?

You would set the instance variable as an action like is moveable to false

Then you check condition boolean is NOT set (you invert with a right mouse click)

Or you make instance variables with numbers or letters - her you check condition objSprite variable = "moveable"

I am having the hardest time making something false change to true.

I have the instance variable set to false and I have it named. Where do access the action? It is not available in under 'system'. When 'sprite1' is overlapping 'sprite2', I want the Boolean to change values, but I cannot find the action.

You find it in your object_Sprite

it's like that with all instance variables

Event: Your Upper Object -> Is overlapping another object -> Your Object below

Action: Your Object below -> Toggle Boolean (true)

-> Else: Toggle Boolean (false)

Then take that Boolen as another condition to your touch event, so it only takes place when that boolean is true:

Condition: Your Object below -> Is boolean instance variable set

This condition will check if its true, if you want to check for false you have to invert that condition.

Wow! I can't believe I never looked in the object_sprite. Thank you for the help.