How do i can compare if a object is above a tile

I need put an object only it, and not put a repeated object on same location of a tiled map,

howdo i can to make it?

https://www.dropbox.com/s/9rqnert5onbya ... .capx?dl=0

[quote:25rkq3fg]99Instances2Go

very thank you, but in my project the thing sprite was created in same location the 20 sprites with the same name, why this is ocurring?

Instances have always the same 'name'. I have no idea what you have done.

Still this is not what I need, I should only create one tower for each tile, I'll put the tower with the mouse touch

Very Thank you dear friend, i changed the tilemap to tiled background, i think wif it will be working fine.