clean up plates too far from the camera

game.gd

@@ -2,6 +2,8 @@ extends Node2D
 
 export (PackedScene) var _PlateScene: PackedScene
 
+signal screen_scrolled(camera_position)
+
 var _is_ready: bool = false
 var _is_game_over: bool = false
 var _game_started: bool = false
@@ -35,6 +37,10 @@ func _physics_process(delta: float) -> void:
 	if $MainCamera.global_position.y - _last_pos.y > rand_range(50, 80):
 		var plate: RigidBody2D = _PlateScene.instance()
 		add_child(plate)
+
+		plate.connect("camera_checked", self, "_on_Plate_camera_checked")
+		connect("screen_scrolled", plate, "_on_Game_screen_scrolled")
+
 		randomize()
 
 		var left: float = $MainCamera.global_position.x - 400
@@ -61,3 +67,7 @@ func _on_HammeredNail_nail_died() -> void:
 
 func _on_Timer_timeout() -> void:
 	_is_ready = true
+
+
+func _on_Plate_camera_checked() -> void:
+	emit_signal("screen_scrolled", $MainCamera.global_position)

plate/plate.gd

@@ -0,0 +1,16 @@
+extends RigidBody2D
+
+
+# Declare member variables here. Examples:
+# var a = 2
+# var b = "text"
+
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass # Replace with function body.
+
+
+# Called every frame. 'delta' is the elapsed time since the previous frame.
+#func _process(delta):
+#	pass

plate/plate.tscn

@@ -1,20 +1,36 @@
-[gd_scene load_steps=4 format=2]
+[gd_scene load_steps=5 format=2]
 
 [ext_resource path="res://plate/plate.PNG" type="Texture" id=1]
 
-[sub_resource type="PhysicsMaterial" id=1]
+[sub_resource type="PhysicsMaterial" id=3]
 rough = true
 absorbent = true
 
+[sub_resource type="GDScript" id=4]
+script/source = "extends RigidBody2D
+
+signal camera_checked
+
+
+func _on_Game_screen_scrolled(camera_position: Vector2) -> void:
+	if camera_position.y - global_position.y > 1000:
+		queue_free()
+
+
+func _on_Timer_timeout():
+	emit_signal(\"camera_checked\")
+"
+
 [sub_resource type="CircleShape2D" id=2]
 radius = 41.9254
 
 [node name="Plate" type="RigidBody2D"]
 mass = 0.01
-physics_material_override = SubResource( 1 )
+physics_material_override = SubResource( 3 )
 gravity_scale = 0.0
 contacts_reported = 2
 contact_monitor = true
+script = SubResource( 4 )
 __meta__ = {
 "_edit_lock_": true
 }
@@ -30,3 +46,9 @@ shape = SubResource( 2 )
 __meta__ = {
 "_edit_lock_": true
 }
+
+[node name="Timer" type="Timer" parent="."]
+wait_time = 5.0
+autostart = true
+
+[connection signal="timeout" from="Timer" to="." method="_on_Timer_timeout"]