Oh, side note... just remembered instance_create() has been removed in GMS2 and it's now instance_create_layer() or something like that... you'll need to modify the code snippet to generate the correct functon name (and add a layer name) if you're going to use it in GMS2, but hopefully that's easy enough. (I don't use GMS2 a lot myself, I mostly import projects originally made in GMS1 and then export them without doing any actual editing)