diff --git a/.github/workflows/checks.yaml b/.github/workflows/checks.yaml
index f8057221..ea5086d6 100644
--- a/.github/workflows/checks.yaml
+++ b/.github/workflows/checks.yaml
@@ -27,7 +27,7 @@ jobs:
     name: Tests
     strategy:
       matrix:
-        godot-version: [4.2.2, 4.3.0]
+        godot-version: [4.3.0]
     runs-on: ubuntu-latest
     steps:
     - name: Checkout
diff --git a/addons/block_code/blocks/communication/add_node_to_group.tres b/addons/block_code/blocks/communication/add_node_to_group.tres
index 2e386d22..40dd39d9 100644
--- a/addons/block_code/blocks/communication/add_node_to_group.tres
+++ b/addons/block_code/blocks/communication/add_node_to_group.tres
@@ -25,3 +25,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("1_p83c7")
+hidden = false
diff --git a/addons/block_code/blocks/communication/add_to_group.tres b/addons/block_code/blocks/communication/add_to_group.tres
index 04e14a6f..b7eff98d 100644
--- a/addons/block_code/blocks/communication/add_to_group.tres
+++ b/addons/block_code/blocks/communication/add_to_group.tres
@@ -25,3 +25,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("2_42ixf")
+hidden = false
diff --git a/addons/block_code/blocks/communication/call_method_group.tres b/addons/block_code/blocks/communication/call_method_group.tres
index 06515f55..e69ae4fd 100644
--- a/addons/block_code/blocks/communication/call_method_group.tres
+++ b/addons/block_code/blocks/communication/call_method_group.tres
@@ -25,3 +25,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("1_of577")
+hidden = false
diff --git a/addons/block_code/blocks/communication/get_node.tres b/addons/block_code/blocks/communication/get_node.tres
index 22f7f5ff..8f86a4f9 100644
--- a/addons/block_code/blocks/communication/get_node.tres
+++ b/addons/block_code/blocks/communication/get_node.tres
@@ -25,3 +25,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("1_we5wl")
+hidden = false
diff --git a/addons/block_code/blocks/communication/is_in_group.tres b/addons/block_code/blocks/communication/is_in_group.tres
index afd089d8..a5200ce6 100644
--- a/addons/block_code/blocks/communication/is_in_group.tres
+++ b/addons/block_code/blocks/communication/is_in_group.tres
@@ -25,3 +25,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("2_o165d")
+hidden = false
diff --git a/addons/block_code/blocks/communication/is_node_in_group.tres b/addons/block_code/blocks/communication/is_node_in_group.tres
index d56b3f7e..1d535f5f 100644
--- a/addons/block_code/blocks/communication/is_node_in_group.tres
+++ b/addons/block_code/blocks/communication/is_node_in_group.tres
@@ -25,3 +25,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("1_r4prw")
+hidden = false
diff --git a/addons/block_code/blocks/communication/remove_from_group.tres b/addons/block_code/blocks/communication/remove_from_group.tres
index b25fe8ad..78fd3dd4 100644
--- a/addons/block_code/blocks/communication/remove_from_group.tres
+++ b/addons/block_code/blocks/communication/remove_from_group.tres
@@ -25,3 +25,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("1_i50fw")
+hidden = false
diff --git a/addons/block_code/blocks/communication/remove_node_from_group.tres b/addons/block_code/blocks/communication/remove_node_from_group.tres
index defa9251..338c1ce1 100644
--- a/addons/block_code/blocks/communication/remove_node_from_group.tres
+++ b/addons/block_code/blocks/communication/remove_node_from_group.tres
@@ -25,3 +25,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("1_h3lhb")
+hidden = false
diff --git a/addons/block_code/blocks/graphics/animationplayer_play.tres b/addons/block_code/blocks/graphics/animationplayer_play.tres
index 3a593f83..f56dafaf 100644
--- a/addons/block_code/blocks/graphics/animationplayer_play.tres
+++ b/addons/block_code/blocks/graphics/animationplayer_play.tres
@@ -43,3 +43,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("2_7ymgi")
+hidden = false
diff --git a/addons/block_code/blocks/input/is_input_actioned.tres b/addons/block_code/blocks/input/is_input_actioned.tres
index 5f7545f3..2b4062fa 100644
--- a/addons/block_code/blocks/input/is_input_actioned.tres
+++ b/addons/block_code/blocks/input/is_input_actioned.tres
@@ -25,3 +25,4 @@ defaults = {
 signal_name = ""
 scope = ""
 extension_script = ExtResource("2_h11b7")
+hidden = false
diff --git a/addons/block_code/blocks/logic/compare.tres b/addons/block_code/blocks/logic/compare.tres
index d4b4dc4f..b3f40b0f 100644
--- a/addons/block_code/blocks/logic/compare.tres
+++ b/addons/block_code/blocks/logic/compare.tres
@@ -25,3 +25,4 @@ defaults = {
 }
 signal_name = ""
 scope = ""
+hidden = false
diff --git a/addons/block_code/blocks/sounds/pause_continue_sound.tres b/addons/block_code/blocks/sounds/pause_continue_sound.tres
index 17487bbc..68d0c538 100644
--- a/addons/block_code/blocks/sounds/pause_continue_sound.tres
+++ b/addons/block_code/blocks/sounds/pause_continue_sound.tres
@@ -28,3 +28,4 @@ defaults = {
 }
 signal_name = ""
 scope = ""
+hidden = false
diff --git a/addons/block_code/code_generation/block_definition.gd b/addons/block_code/code_generation/block_definition.gd
index 26ac9e70..8857421c 100644
--- a/addons/block_code/code_generation/block_definition.gd
+++ b/addons/block_code/code_generation/block_definition.gd
@@ -30,6 +30,11 @@ const FORMAT_STRING_PATTERN = "\\[(?<out_parameter>[^\\]]+)\\]|\\{(?<in_paramete
 
 @export var extension_script: GDScript
 
+## If true, do not show this block in the picker. This allows a block
+## definition to be kept for backwards-compatibility with existing block
+## programs, but not available for use in new programs.
+@export var hidden: bool = false
+
 static var _display_template_regex := RegEx.create_from_string(FORMAT_STRING_PATTERN)
 
 
diff --git a/addons/block_code/simple_spawner/simple_spawner.gd b/addons/block_code/simple_spawner/simple_spawner.gd
index fac71698..601ac85c 100644
--- a/addons/block_code/simple_spawner/simple_spawner.gd
+++ b/addons/block_code/simple_spawner/simple_spawner.gd
@@ -23,17 +23,26 @@ enum LimitBehavior { REPLACE, NO_SPAWN }
 
 ## The period of time in seconds to spawn another component. If zero, they won't spawn
 ## automatically. Use the "Spawn" block.
-@export_range(0.0, 10.0, 0.1, "or_greater") var spawn_frequency: float = 0.0:
-	set = _set_spawn_fraquency
+@export_range(0.0, 10.0, 0.1, "or_greater", "suffix:s") var spawn_period: float = 0.0:
+	set = _set_spawn_period
 
 ## How many spawned scenes are allowed. If zero, there is no limit.
-@export_range(0, 50, 0.1, "or_greater") var spawn_limit: int = 50
+@export_range(0, 50, 0.1, "or_greater", "suffix:scenes") var spawn_limit: int = 50
 
 ## What happens when the limit is reached and a new spawn is attempted:
 ## - Replace: Remove the oldest spawned scene and spawn a new one.
 ## - No Spawn: No spawn happens until any spawned scene is removed by other means.
 @export var limit_behavior: LimitBehavior
 
+## Old name for [member spawn_period].
+##
+## @deprecated: Use [member spawn_period] instead
+@export_storage var spawn_frequency: float:
+	get:
+		return spawn_period
+	set(value):
+		spawn_period = value
+
 var _timer: Timer
 var _spawned_scenes: Array[Node]
 
@@ -53,20 +62,20 @@ func _remove_oldest_spawned():
 		spawned.get_parent().remove_child(spawned)
 
 
-func _set_spawn_fraquency(new_frequency: float):
-	spawn_frequency = new_frequency
+func _set_spawn_period(new_period: float):
+	spawn_period = new_period
 	if not _timer or not is_instance_valid(_timer):
 		return
-	_timer.wait_time = spawn_frequency
+	_timer.wait_time = spawn_period
 
 
 func spawn_start():
-	if spawn_frequency == 0.0:
+	if spawn_period == 0.0:
 		return
 	if not _timer or not is_instance_valid(_timer):
 		_timer = Timer.new()
 		add_child(_timer)
-		_timer.wait_time = spawn_frequency
+		_timer.wait_time = spawn_period
 		_timer.timeout.connect(spawn_once)
 	_timer.start()
 	spawn_once.call_deferred()
@@ -107,8 +116,9 @@ func spawn_once():
 			spawned.position = global_position
 
 
+## @deprecated: Set the [member spawn_period] property instead
 func do_set_spawn_frequency(new_frequency: float):
-	_set_spawn_fraquency(new_frequency)
+	spawn_period = new_frequency
 
 
 static func setup_custom_blocks():
@@ -159,6 +169,7 @@ static func setup_custom_blocks():
 	block_definition.type = Types.BlockType.STATEMENT
 	block_definition.display_template = "set spawn frequency to {new_frequency: FLOAT}"
 	block_definition.code_template = "do_set_spawn_frequency({new_frequency})"
+	block_definition.hidden = true
 	block_list.append(block_definition)
 
 	block_definition = BlockDefinition.new()
@@ -169,6 +180,26 @@ static func setup_custom_blocks():
 	block_definition.variant_type = TYPE_FLOAT
 	block_definition.display_template = "spawn frequency"
 	block_definition.code_template = "spawn_frequency"
+	block_definition.hidden = true
+	block_list.append(block_definition)
+
+	block_definition = BlockDefinition.new()
+	block_definition.name = &"simplespawner_set_spawn_period"
+	block_definition.target_node_class = _class_name
+	block_definition.category = "Lifecycle | Spawn"
+	block_definition.type = Types.BlockType.STATEMENT
+	block_definition.display_template = "set spawn period to {new_period: FLOAT}"
+	block_definition.code_template = "spawn_period = {new_period}"
+	block_list.append(block_definition)
+
+	block_definition = BlockDefinition.new()
+	block_definition.name = &"simplespawner_get_spawn_period"
+	block_definition.target_node_class = _class_name
+	block_definition.category = "Lifecycle | Spawn"
+	block_definition.type = Types.BlockType.VALUE
+	block_definition.variant_type = TYPE_FLOAT
+	block_definition.display_template = "spawn period"
+	block_definition.code_template = "spawn_period"
 	block_list.append(block_definition)
 
 	BlocksCatalog.add_custom_blocks(_class_name, block_list, [], {})
diff --git a/addons/block_code/ui/picker/picker.gd b/addons/block_code/ui/picker/picker.gd
index 8d061d82..098c0b8e 100644
--- a/addons/block_code/ui/picker/picker.gd
+++ b/addons/block_code/ui/picker/picker.gd
@@ -73,7 +73,7 @@ func _update_block_components():
 		block_category_display.hide()
 
 	for category in block_categories:
-		var block_definitions := _context.block_script.get_blocks_in_category(category)
+		var block_definitions = _context.block_script.get_blocks_in_category(category).filter(func(block): return not block.hidden)
 		var order_override = CATEGORY_ORDER_OVERRIDE.get(category.name)
 		if order_override:
 			block_definitions.sort_custom(_sort_blocks_by_list_order.bind(order_override))
diff --git a/asset-template.json.hb b/asset-template.json.hb
index d9539075..a0093ae6 100644
--- a/asset-template.json.hb
+++ b/asset-template.json.hb
@@ -2,7 +2,7 @@
   "title": "Block Coding",
   "description": "Create games using a high-level, block-based visual programming language.\r\n\r\nIntended as an educational tool for learners in the earlier stages of their journey towards becoming game developers. This plugin lets you create your first games with high-level blocks, avoiding the immediate need to learn to code in GDScript. Building games in this way provides a gentle introduction to programming concepts and allows you to focus your efforts on becoming familiar with the rest of the Godot Editor UI.",
   "category_id": "5",
-  "godot_version": "4.2",
+  "godot_version": "4.3",
   "version_string": "{{ context.release.name }}",
   "cost": "MIT",
   "support_level": "community",