diff --git a/16_Bug/csharp/Bug.cs b/16_Bug/csharp/Bug.cs
new file mode 100644
index 00000000..e013d1b6
--- /dev/null
+++ b/16_Bug/csharp/Bug.cs
@@ -0,0 +1,13 @@
+using BugGame.Parts;
+using BugGame.Resources;
+
+namespace BugGame;
+
+internal class Bug
+{
+    private readonly Body _body = new();
+
+    public bool IsComplete => _body.IsComplete;
+
+    public bool TryAdd(IPart part, out Message message) => _body.TryAdd(part, out message);
+}
\ No newline at end of file
diff --git a/16_Bug/csharp/Parts/Body.cs b/16_Bug/csharp/Parts/Body.cs
index 61aad080..65fde374 100644
--- a/16_Bug/csharp/Parts/Body.cs
+++ b/16_Bug/csharp/Parts/Body.cs
@@ -13,6 +13,8 @@ internal class Body : ParentPart
     {
     }
 
+    public override bool IsComplete => _neck.IsComplete && _tail.IsComplete && _legs.IsComplete;
+
     protected override bool TryAddCore(IPart part, out Message message)
         => part switch
         {
diff --git a/16_Bug/csharp/Parts/Head.cs b/16_Bug/csharp/Parts/Head.cs
index 2d5e705d..bafa172f 100644
--- a/16_Bug/csharp/Parts/Head.cs
+++ b/16_Bug/csharp/Parts/Head.cs
@@ -11,6 +11,8 @@ internal class Head : ParentPart
     {
     }
 
+    public override bool IsComplete => _feelers.IsComplete;
+
     protected override bool TryAddCore(IPart part, out Message message)
         => part switch
         {
diff --git a/16_Bug/csharp/Parts/IPart.cs b/16_Bug/csharp/Parts/IPart.cs
index e325a7c1..3d1a45c5 100644
--- a/16_Bug/csharp/Parts/IPart.cs
+++ b/16_Bug/csharp/Parts/IPart.cs
@@ -3,4 +3,5 @@ namespace BugGame.Parts;
 internal interface IPart
 {
     string Name { get; }
+    bool IsComplete { get; }
 }
diff --git a/16_Bug/csharp/Parts/Neck.cs b/16_Bug/csharp/Parts/Neck.cs
index 035d0c18..ee5853e2 100644
--- a/16_Bug/csharp/Parts/Neck.cs
+++ b/16_Bug/csharp/Parts/Neck.cs
@@ -11,6 +11,8 @@ internal class Neck : ParentPart
     {
     }
 
+    public override bool IsComplete => _head.IsComplete;
+
     protected override bool TryAddCore(IPart part, out Message message)
         => part switch
         {
diff --git a/16_Bug/csharp/Parts/Part.cs b/16_Bug/csharp/Parts/Part.cs
index a1a5d64d..ada12b8c 100644
--- a/16_Bug/csharp/Parts/Part.cs
+++ b/16_Bug/csharp/Parts/Part.cs
@@ -13,6 +13,8 @@ internal class Part
         _duplicateMessage = duplicateMessage;
     }
 
+    public virtual bool IsComplete => IsPresent;
+
     protected bool IsPresent { get; private set; }
 
     public string Name => GetType().Name;
diff --git a/16_Bug/csharp/Parts/PartCollection.cs b/16_Bug/csharp/Parts/PartCollection.cs
index 43a684b5..aac0bbd2 100644
--- a/16_Bug/csharp/Parts/PartCollection.cs
+++ b/16_Bug/csharp/Parts/PartCollection.cs
@@ -16,6 +16,8 @@ internal class PartCollection
         _fullMessage = fullMessage;
     }
 
+    public bool IsComplete => _count == _maxCount;
+
     public bool TryAddOne(out Message message)
     {
         if (_count < _maxCount)
diff --git a/16_Bug/csharp/Resources/Message.cs b/16_Bug/csharp/Resources/Message.cs
index 5cd9f998..be85faf8 100644
--- a/16_Bug/csharp/Resources/Message.cs
+++ b/16_Bug/csharp/Resources/Message.cs
@@ -1,3 +1,5 @@
+using BugGame.Parts;
+
 namespace BugGame.Resources;
 
 internal class Message