Tutorial polish

hidden_sign.tscn

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+[gd_scene format=3 uid="uid://dt43trxumfv0i"]
+
+[ext_resource type="Script" uid="uid://b64hyvumk366h" path="res://hidden_sign.gd" id="1_a20ku"]
+[ext_resource type="Texture2D" uid="uid://djlqqmqpsd0kc" path="res://art/sign.png" id="2_soj2u"]
+[ext_resource type="Texture2D" uid="uid://d0cd1alr8k706" path="res://art/interact_button.png" id="3_7o2b3"]
+
+[sub_resource type="RectangleShape2D" id="RectangleShape2D_eumkw"]
+size = Vector2(26, 32)
+
+[node name="HiddenSign" type="Node2D" unique_id=1201409437]
+script = ExtResource("1_a20ku")
+
+[node name="Sprite2D" type="Sprite2D" parent="." unique_id=1680278216]
+position = Vector2(0, -16)
+texture = ExtResource("2_soj2u")
+
+[node name="Area2D" type="Area2D" parent="Sprite2D" unique_id=2050186824]
+
+[node name="CollisionShape2D" type="CollisionShape2D" parent="Sprite2D/Area2D" unique_id=1560168165]
+shape = SubResource("RectangleShape2D_eumkw")
+
+[node name="ButtonPrompt" type="Sprite2D" parent="Sprite2D" unique_id=1864817335]
+visible = false
+position = Vector2(0, -8.000002)
+scale = Vector2(0.8, 0.8)
+texture = ExtResource("3_7o2b3")
+
+[connection signal="interacted" from="." to="." method="_on_interacted"]
+[connection signal="body_entered" from="Sprite2D/Area2D" to="." method="_on_approach"]
+[connection signal="body_exited" from="Sprite2D/Area2D" to="." method="_on_abandon"]