diff --git a/Source/Examples/Tutorial/T02_Vertex_Array_Cube.cs b/Source/Examples/Tutorial/T02_Vertex_Array_Cube.cs
index 17c5ed05..1715ce8c 100644
--- a/Source/Examples/Tutorial/T02_Vertex_Array_Cube.cs
+++ b/Source/Examples/Tutorial/T02_Vertex_Array_Cube.cs
@@ -15,6 +15,9 @@ using OpenTK.OpenGL;
 
 namespace Examples.Tutorial
 {
+    /// <summary>
+    /// Demonstrates Vertex Arrays (in system memory).  Example is incomplete (documentation).
+    /// </summary>
     class T02_Vertex_Array_Cube : GameWindow, IExample
     {
         float angle;
diff --git a/Source/Examples/Tutorial/T03_Immediate_Mode_Cube.cs b/Source/Examples/Tutorial/T03_Immediate_Mode_Cube.cs
index 3b204532..9e2c5ffe 100644
--- a/Source/Examples/Tutorial/T03_Immediate_Mode_Cube.cs
+++ b/Source/Examples/Tutorial/T03_Immediate_Mode_Cube.cs
@@ -20,6 +20,9 @@ using OpenTK.Platform;
 
 namespace Examples.Tutorial
 {
+    /// <summary>
+    /// Demonstrates immediate mode rendering. Example is incomplete, and will probably go away in the future.
+    /// </summary>
     public class T03_Immediate_Mode_Cube : OpenTK.GameWindow, IExample
     {
         #region --- Fields ---
diff --git a/Source/Examples/Tutorial/T04_Lit_Cube.cs b/Source/Examples/Tutorial/T04_Lit_Cube.cs
index 7c08ae4f..661cf389 100644
--- a/Source/Examples/Tutorial/T04_Lit_Cube.cs
+++ b/Source/Examples/Tutorial/T04_Lit_Cube.cs
@@ -16,7 +16,7 @@ using Examples.Shapes;
 namespace Examples.Tutorial
 {
     /// <summary>
-    /// Demonstrates fixed-function OpenGL lighting. Tutorial is incomplete!
+    /// Demonstrates fixed-function OpenGL lighting.  Example is incomplete (documentation).
     /// </summary>
     class T04_Lit_Cube : GameWindow, IExample
     {
@@ -53,8 +53,9 @@ namespace Examples.Tutorial
             GL.Lightv(GL.Enums.LightName.LIGHT0, GL.Enums.LightParameter.DIFFUSE, new float[] { 1.0f, 1.0f, 1.0f, 1.0f });
             GL.Lightv(GL.Enums.LightName.LIGHT0, GL.Enums.LightParameter.SPECULAR, new float[] { 1.0f, 1.0f, 1.0f, 1.0f });
             GL.LightModelv(GL.Enums.LightModelParameter.LIGHT_MODEL_AMBIENT, new float[] { 0.2f, 0.2f, 0.2f, 1.0f });
-            //GL.Enable(GL.Enums.EnableCap.LIGHTING);
-            //GL.Enable(GL.Enums.EnableCap.LIGHT0);
+            GL.LightModel(GL.Enums.LightModelParameter.LIGHT_MODEL_TWO_SIDE, 1);
+            GL.Enable(GL.Enums.EnableCap.LIGHTING);
+            GL.Enable(GL.Enums.EnableCap.LIGHT0);
 
             // Use GL.Material to set your object's material parameters..
             GL.Materialv(GL.Enums.MaterialFace.FRONT, GL.Enums.MaterialParameter.AMBIENT, new float[] { 0.3f, 0.3f, 0.3f, 1.0f });
@@ -113,17 +114,17 @@ namespace Examples.Tutorial
             }
 
             if (Mouse[OpenTK.Input.MouseButton.Left])
-                x_angle += Mouse.XDelta * 2;
+                x_angle += Mouse.XDelta;
             else
                 x_angle += 0.5f;
 
-            if (Mouse[OpenTK.Input.MouseButton.Right])
-                zoom += Mouse.YDelta * 0.5f;
+            zoom = Mouse.Wheel * 0.5f;
 
-            if (x_angle > 720.0f)
-                x_angle -= 720.0f;
-            else if (x_angle < -720.0f)
-                x_angle += 720.0f;
+            // Do not leave x_angle drift too far away, as this will cause inaccuracies.
+            if (x_angle > 360.0f)
+                x_angle -= 360.0f;
+            else if (x_angle < -360.0f)
+                x_angle += 360.0f;
         }
 
         #endregion
diff --git a/Source/Examples/Tutorial/T07_Display_Lists_Flower.cs b/Source/Examples/Tutorial/T07_Display_Lists_Flower.cs
index c73a0fcc..83448ced 100644
--- a/Source/Examples/Tutorial/T07_Display_Lists_Flower.cs
+++ b/Source/Examples/Tutorial/T07_Display_Lists_Flower.cs
@@ -23,7 +23,7 @@ using System.Threading;
 
 namespace Examples.Tutorial
 {
-    public partial class T07_Display_Lists_Flower : GameWindow, IExample
+    public class T07_Display_Lists_Flower : GameWindow, IExample
     {
         #region --- Variables ---
 
diff --git a/Source/Examples/Tutorial/T10_GLSL_Cube.cs b/Source/Examples/Tutorial/T10_GLSL_Cube.cs
index dd76eaa4..44f68eb4 100644
--- a/Source/Examples/Tutorial/T10_GLSL_Cube.cs
+++ b/Source/Examples/Tutorial/T10_GLSL_Cube.cs
@@ -22,7 +22,7 @@ using OpenTK;
 namespace Examples.Tutorial
 {
     /// <summary>
-    /// Demonstrates how to load and use a simple OpenGL shader program.
+    /// Demonstrates how to load and use a simple OpenGL shader program. Example is incomplete (documentation).
     /// </summary>
     public class T10_GLSL_Cube : GameWindow, IExample
     {