diff --git a/teethris.NET/SDK/GameRunner.cs b/teethris.NET/SDK/GameRunner.cs
@@ -35,11 +35,11 @@ public void Tick()
         ///     Whether the key pressed event should be passed to the next piece of
         ///     software down the chain.
         /// </returns>
-        public bool KeyPressed(keyboardNames key)
+        public bool KeyPressed(KeyboardNames key)
         {
             if (this.active)
             {
-                if (key == keyboardNames.ESC)
+                if (key == KeyboardNames.ESC)
                 {
                     this.game.Dispose();
                     this.game = null;
@@ -49,7 +49,7 @@ public bool KeyPressed(keyboardNames key)
                 this.game.KeyPress(key);
                 return false;
             }
-            if (key == keyboardNames.ESC)
+            if (key == KeyboardNames.ESC)
             {
                 this.game = new T();
                 this.active = true;

diff --git a/teethris.NET/SDK/IGame.cs b/teethris.NET/SDK/IGame.cs
@@ -15,7 +15,7 @@ namespace teethris.NET.SDK
 {
     public interface IGame : IDisposable
     {
-        void KeyPress(keyboardNames key);
+        void KeyPress(KeyboardNames key);
         void Tick();
     }
 }
diff --git a/teethris.NET/SDK/KeyboardLayout.cs b/teethris.NET/SDK/KeyboardLayout.cs
diff --git a/teethris.NET/SDK/LogitechGSDK.cs b/teethris.NET/SDK/LogitechGSDK.cs
@@ -14,7 +14,7 @@
 
 namespace LedCSharp
 {
-    public enum keyboardNames
+    public enum KeyboardNames
     {
         ESC = 0x01,
         F1 = 0x3b,
@@ -188,15 +188,15 @@ public class LogitechGSDK
             int greenPercentage, int bluePercentage);
 
         [DllImport("LogitechLedEnginesWrapper ", CallingConvention = CallingConvention.Cdecl)]
-        public static extern bool LogiLedSetLightingForKeyWithKeyName(keyboardNames keyCode, int redPercentage,
+        public static extern bool LogiLedSetLightingForKeyWithKeyName(KeyboardNames keyCode, int redPercentage,
             int greenPercentage, int bluePercentage);
 
-        public static bool SetLighting(keyboardNames keyCode, int redPercentage, int greenPercentage, int bluePercentage)
+        public static bool SetLighting(KeyboardNames keyCode, int redPercentage, int greenPercentage, int bluePercentage)
         {
             return LogiLedSetLightingForKeyWithKeyName(keyCode, redPercentage, greenPercentage, bluePercentage);
         }
 
-        public static bool SetLighting(keyboardNames keyCode, PlayerColor color, int percentage)
+        public static bool SetLighting(KeyboardNames keyCode, PlayerColor color, int percentage)
         {
             switch (color)
             {
@@ -210,22 +210,22 @@ public static bool SetLighting(keyboardNames keyCode, PlayerColor color, int per
         }
 
         [DllImport("LogitechLedEnginesWrapper ", CallingConvention = CallingConvention.Cdecl)]
-        public static extern bool LogiLedSaveLightingForKey(keyboardNames keyName);
+        public static extern bool LogiLedSaveLightingForKey(KeyboardNames keyName);
 
         [DllImport("LogitechLedEnginesWrapper ", CallingConvention = CallingConvention.Cdecl)]
-        public static extern bool LogiLedRestoreLightingForKey(keyboardNames keyName);
+        public static extern bool LogiLedRestoreLightingForKey(KeyboardNames keyName);
 
         [DllImport("LogitechLedEnginesWrapper ", CallingConvention = CallingConvention.Cdecl)]
-        public static extern bool LogiLedFlashSingleKey(keyboardNames keyName, int redPercentage, int greenPercentage,
+        public static extern bool LogiLedFlashSingleKey(KeyboardNames keyName, int redPercentage, int greenPercentage,
             int bluePercentage, int msDuration, int msInterval);
 
         [DllImport("LogitechLedEnginesWrapper ", CallingConvention = CallingConvention.Cdecl)]
-        public static extern bool LogiLedPulseSingleKey(keyboardNames keyName, int startRedPercentage,
+        public static extern bool LogiLedPulseSingleKey(KeyboardNames keyName, int startRedPercentage,
             int startGreenPercentage, int startBluePercentage, int finishRedPercentage, int finishGreenPercentage,
             int finishBluePercentage, int msDuration, bool isInfinite);
 
         [DllImport("LogitechLedEnginesWrapper ", CallingConvention = CallingConvention.Cdecl)]
-        public static extern bool LogiLedStopEffectsOnKey(keyboardNames keyName);
+        public static extern bool LogiLedStopEffectsOnKey(KeyboardNames keyName);
 
         [DllImport("LogitechLedEnginesWrapper ", CallingConvention = CallingConvention.Cdecl)]
         public static extern void LogiLedShutdown();

diff --git a/teethris.NET/Snake.cs b/teethris.NET/Snake.cs
@@ -11,32 +11,36 @@
 using System.Collections.Generic;
 using System.Linq;
 using LedCSharp;
+using teethris.NET.SDK;
 using static LedCSharp.LogitechGSDK;
 
 namespace teethris.NET
 {
     public class Snake
     {
-        private readonly List<keyboardNames> keys = new List<keyboardNames>();
+        private readonly List<KeyboardNames> keys = new List<KeyboardNames>();
         private readonly PlayerColor color;
 
-        public Snake(keyboardNames key, PlayerColor color)
+        public Snake(KeyboardNames key, PlayerColor color)
         {
             this.color = color;
             this.keys.Add(key);
 
             SetLighting(key, color, 100);
         }
 
-        public keyboardNames Head => this.keys.Last();
+        public KeyboardNames Head => this.keys.Last();
 
-        public void AddIfNeighbour(keyboardNames key)
+        public bool AddIfNeighbour(KeyboardNames key)
         {
+            if (this.keys.Contains(key) || !KeyboardLayout.Instance[this.Head].Contains(key)) return false;
+
             SetLighting(this.Head, this.color, 30);
 
             this.keys.Add(key);
 
             SetLighting(this.Head, this.color, 100);
+            return true;
         }
     }
 }