diff --git a/Barotrauma/BarotraumaClient/ClientSource/GameMain.cs b/Barotrauma/BarotraumaClient/ClientSource/GameMain.cs
index 114c52e72..b96abab6a 100644
--- a/Barotrauma/BarotraumaClient/ClientSource/GameMain.cs
+++ b/Barotrauma/BarotraumaClient/ClientSource/GameMain.cs
@@ -998,6 +998,8 @@ namespace Barotrauma
 
                 SoundManager?.Update();
 
+                GameMain.Lua.hook.Call("think", new object[] { });
+
                 Timing.Accumulator -= Timing.Step;
 
                 sw.Stop();
diff --git a/Barotrauma/BarotraumaClient/ClientSource/Lua/LuaClasses.cs b/Barotrauma/BarotraumaClient/ClientSource/Lua/LuaClasses.cs
new file mode 100644
index 000000000..db45ecdd6
--- /dev/null
+++ b/Barotrauma/BarotraumaClient/ClientSource/Lua/LuaClasses.cs
@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Text;
+using Barotrauma.Networking;
+
+namespace Barotrauma
+{
+	partial class LuaSetup
+	{
+		public class LuaGUI
+		{
+			LuaSetup env;
+			public LuaGUI(LuaSetup _env)
+			{
+				env = _env;
+			}
+
+			public ChatBox ChatBox
+			{
+				get
+				{
+					return GameMain.Client.ChatBox;
+				}
+			}
+		}
+	}
+}
diff --git a/Barotrauma/BarotraumaClient/ClientSource/Networking/GameClient.cs b/Barotrauma/BarotraumaClient/ClientSource/Networking/GameClient.cs
index 46bd3de8e..77c4765eb 100644
--- a/Barotrauma/BarotraumaClient/ClientSource/Networking/GameClient.cs
+++ b/Barotrauma/BarotraumaClient/ClientSource/Networking/GameClient.cs
@@ -2805,6 +2805,10 @@ namespace Barotrauma.Networking
 
         public override void AddChatMessage(ChatMessage message)
         {
+            var should = new LuaResult(GameMain.Lua.hook.Call("chatMessage", new object[] { message.Text, message.SenderClient, message.Type, message }));
+
+            if (should.Bool()) return;
+
             base.AddChatMessage(message);
 
             if (string.IsNullOrEmpty(message.Text)) { return; }
diff --git a/Barotrauma/BarotraumaServer/ServerSource/GameMain.cs b/Barotrauma/BarotraumaServer/ServerSource/GameMain.cs
index 2598af51f..9df9222e6 100644
--- a/Barotrauma/BarotraumaServer/ServerSource/GameMain.cs
+++ b/Barotrauma/BarotraumaServer/ServerSource/GameMain.cs
@@ -365,7 +365,7 @@ namespace Barotrauma
                     TaskPool.Update();
                     CoroutineManager.Update((float)Timing.Step, (float)Timing.Step);
 
-                    GameMain.Lua.hook.Call("think", new object[] { elapsedTime, Timing.TotalTime });
+                    GameMain.Lua.hook.Call("think", new object[] { });
 
                     Timing.Accumulator -= Timing.Step;
                 }
diff --git a/Barotrauma/BarotraumaShared/SharedSource/Lua/LuaClasses.cs b/Barotrauma/BarotraumaShared/SharedSource/Lua/LuaClasses.cs
index 74ece8f06..edf0c560f 100644
--- a/Barotrauma/BarotraumaShared/SharedSource/Lua/LuaClasses.cs
+++ b/Barotrauma/BarotraumaShared/SharedSource/Lua/LuaClasses.cs
@@ -554,8 +554,9 @@ namespace Barotrauma
 
 			public object Call(string name, object[] args)
 			{
+				if (env == null) return null;
 				if (name == null) return null;
-				if(args == null) { args = new object[] { }; }
+				if (args == null) { args = new object[] { }; }
 
 				if (!hookFunctions.ContainsKey(name))
 					return null;
diff --git a/Barotrauma/BarotraumaShared/SharedSource/Lua/LuaSetup.cs b/Barotrauma/BarotraumaShared/SharedSource/Lua/LuaSetup.cs
index 3799ca5af..d69cf63e5 100644
--- a/Barotrauma/BarotraumaShared/SharedSource/Lua/LuaSetup.cs
+++ b/Barotrauma/BarotraumaShared/SharedSource/Lua/LuaSetup.cs
@@ -204,15 +204,15 @@ namespace Barotrauma
 		private void AddCallMetaMember(IUserDataDescriptor IUDD)
 		{
 			var descriptor = (StandardUserDataDescriptor)IUDD;
+			descriptor.RemoveMetaMember("__call");
 			descriptor.AddMetaMember("__call", new ObjectCallbackMemberDescriptor("__call", HandleCall));
 		}
 
 		public void Stop()
 		{
-
-			lua = null;
-			hook = null;
-			game = null;
+			hook = new LuaHook(null);
+			game = new LuaGame(null);
+			networking = new LuaNetworking(null);
 			luaScriptLoader = null;
 
 			luaSetup = null;
@@ -321,8 +321,14 @@ namespace Barotrauma
 			AddCallMetaMember(UserData.RegisterType<Vector4>());
 			AddCallMetaMember(UserData.RegisterType<CharacterInfo>());
 			AddCallMetaMember(UserData.RegisterType<Signal>());
+			AddCallMetaMember(UserData.RegisterType<Color>());
 
+#if SERVER
 
+#elif CLIENT
+			UserData.RegisterType<LuaGUI>();
+			UserData.RegisterType<ChatBox>();
+#endif
 			lua = new Script(CoreModules.Preset_SoftSandbox);
 
 			lua.Options.DebugPrint = PrintMessage;
@@ -373,6 +379,7 @@ namespace Barotrauma
 			lua.Globals["Vector2"] = UserData.CreateStatic<Vector2>();
 			lua.Globals["Vector3"] = UserData.CreateStatic<Vector3>();
 			lua.Globals["Vector4"] = UserData.CreateStatic<Vector4>();
+			lua.Globals["Color"] = UserData.CreateStatic<Color>();
 			lua.Globals["ChatMessage"] = UserData.CreateStatic<ChatMessage>();
 			lua.Globals["Hull"] = UserData.CreateStatic<Hull>();
 			lua.Globals["InvSlotType"] = UserData.CreateStatic<InvSlotType>();
@@ -384,6 +391,13 @@ namespace Barotrauma
 			lua.Globals["ClientPacketHeader"] = UserData.CreateStatic<ClientPacketHeader>();
 			lua.Globals["ServerPacketHeader"] = UserData.CreateStatic<ServerPacketHeader>();
 
+#if SERVER
+
+#elif CLIENT
+			lua.Globals["GUI"] = new LuaGUI(this);
+#endif
+
+
 			// obsolete
 			lua.Globals["CreateVector2"] = (Func<float, float, Vector2>)CreateVector2;
 			lua.Globals["CreateVector3"] = (Func<float, float, float, Vector3>)CreateVector3;
@@ -424,7 +438,9 @@ namespace Barotrauma
 
 		public LuaSetup()
 		{
-
+			hook = new LuaHook(null);
+			game = new LuaGame(null);
+			networking = new LuaNetworking(null);
 		}
 
 	}
diff --git a/Barotrauma/BarotraumaShared/SharedSource/Networking/ChatMessage.cs b/Barotrauma/BarotraumaShared/SharedSource/Networking/ChatMessage.cs
index 761f6ef89..6d282715f 100644
--- a/Barotrauma/BarotraumaShared/SharedSource/Networking/ChatMessage.cs
+++ b/Barotrauma/BarotraumaShared/SharedSource/Networking/ChatMessage.cs
@@ -79,9 +79,16 @@ namespace Barotrauma.Networking
 
         public readonly string SenderName;
 
+        private Color? customColor = null;
+
         public Color Color
         {
-            get { return MessageColor[(int)Type]; }
+            get 
+            { 
+                if(customColor == null) return MessageColor[(int)Type];
+                return (Color)customColor;
+            }
+			set { customColor = value; }
         }
 
         public static string GetTimeStamp()