It's Cow Game! Version 2.04!

Objects/SkillSpecific/Swimming/BridgeSwimmingZone.gd

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+extends SwimmingZone
+
+@export var bridge:Node2D
+
+func _process(delta):
+	super._process(delta)
+	
+	if bridge != null:
+		if bridge.complete:
+			$SwimmingArea.monitoring = false
+			$SwimmingArea.monitorable = false
+		else:
+			$SwimmingArea.monitoring = true
+			$SwimmingArea.monitorable = true
+	else:
+		$SwimmingArea.monitoring = true
+		$SwimmingArea.monitorable = true

Objects/SkillSpecific/Swimming/NoSwimBlocker.gd

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+extends StaticBody2D
+
+class_name NoSwimBlocker
+
+var messageDelay = 0
+
+func _process(delta):
+	if messageDelay > 0:
+		messageDelay -= delta
+
+func cow_collided():
+	if messageDelay <= 0:
+		var messageString = "You need level " + str(get_parent().swimmingLevelReq) + " swimming to swim here"
+		MessageManager.addMessage(messageString,
+		null, "System", Color.BLUE, true, false)
+		
+		messageDelay = 1.5

Objects/SkillSpecific/Swimming/SwimmingZone.gd

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+extends Node2D
+
+class_name SwimmingZone
+
+@export var liquidColor:Color
+@export var swimmingLevelReq:int
+@export var swimmingXp:int
+@export var swimmingSpeed:int = 160
+@export var viscosity:int = 50
+
+func _ready():
+	%NoSwimShape.polygon = $SwimmingArea.get_child(0).polygon
+	$NoSwimBlocker.position = $SwimmingArea.position
+
+func _process(delta):
+	if LevelManager.skill_check("swimming", swimmingLevelReq):
+		%NoSwimShape.disabled = true
+	else:
+		%NoSwimShape.disabled = false
+
+func add_swam_location():
+	var locationName = LocationManager.currentLocationName
+	SaveManager.save_to_section("SwamAt", str(locationName), true)
+	var config = SaveManager.get_save_config()
+	var swamLocations = config.get_section_keys("SwamAt")
+	if swamLocations.size() >= 5:
+		AchievementManager.complete_achievement("Duathlon")
+
+func _on_swimming_area_area_entered(area):
+	if area.get_parent() is Cow:
+		if LevelManager.skill_check("swimming", swimmingLevelReq):
+			area.get_parent().add_swimming_area(self)
+			add_swam_location()
+	elif area.get_parent() is GroundItem:
+		area.get_parent().interactingTerrains.append(self)
+	elif area.get_parent() is Ball and area.name == "WaterZone":
+		area.get_parent().add_swimming_area(self)
+
+func _on_swimming_area_area_exited(area):
+	if area.get_parent() is Cow:
+		area.get_parent().remove_swimming_area(self)
+	elif area.get_parent() is GroundItem:
+		area.get_parent().interactingTerrains.erase(self)
+	elif area.get_parent() is Ball and area.name == "WaterZone":
+		area.get_parent().remove_swimming_area(self)

Objects/SkillSpecific/Swimming/SwimmingZone.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://dss4ph0tkc0xc"]
+
+[ext_resource type="Script" path="res://Objects/SkillSpecific/Swimming/SwimmingZone.gd" id="1_a05yf"]
+[ext_resource type="Script" path="res://Objects/SkillSpecific/Swimming/NoSwimBlocker.gd" id="2_5bfw5"]
+
+[node name="SwimmingZone" type="Node2D"]
+script = ExtResource("1_a05yf")
+
+[node name="SwimmingArea" type="Area2D" parent="."]
+
+[node name="NoSwimBlocker" type="StaticBody2D" parent="."]
+collision_layer = 4
+collision_mask = 4
+script = ExtResource("2_5bfw5")
+
+[node name="NoSwimShape" type="CollisionPolygon2D" parent="NoSwimBlocker"]
+unique_name_in_owner = true
+
+[connection signal="area_entered" from="SwimmingArea" to="." method="_on_swimming_area_area_entered"]
+[connection signal="area_exited" from="SwimmingArea" to="." method="_on_swimming_area_area_exited"]