Reduce scope of disk 3 quadrant, and make the hidden moving block also visible in editor.

hidden_vertical_long_block.tscn

@@ -4,7 +4,6 @@
 [ext_resource type="PackedScene" uid="uid://ckqable762x8v" path="res://block.tscn" id="2_667v4"]
 
 [node name="HiddenVerticalLongBlock" type="RigidBody2D" unique_id=925152188 groups=["Hidden"]]
-visible = false
 modulate = Color(0, 0.54509807, 0.54509807, 1)
 rotation = 1.5707964
 gravity_scale = 0.0