The onm ouseDown method is used to eliminate the above small grid
Private void onm ouseDown ()
{
Destroy (gameObject);
}
In the absence of instantiation map, this approach all useful,

But, after instantiation map, some can't eliminate,

Have found the reason, because in the small grid of the object under the collision body,

But because of the reason of the map, the collision body cannot cancel, what should I do now?