Improved tutorial

hidden_vertical_long_block.gd

@@ -3,6 +3,7 @@ extends RigidBody2D
 # Called when the node enters the scene tree for the first time.
 func _ready() -> void:
 	add_to_group("Hidden")
+	modulate = Color.DARK_CYAN
 
 # Called every frame. 'delta' is the elapsed time since the previous frame.
 func _process(delta: float) -> void: