// This function runs when we hit another object.
// We get information about the collision and call it "collisionInfo".
void OnCollisionEnter(Collision collisionInfo)
{
// We check if the object we collided with has a tag called "Obstacle".
if (collisionInfo.collider.name == "Cube" && counter == 1)
{
x.explode(collisionInfo.collider.gameObject);
counter++;
}
}