diff --git a/EvoNet/Controls/EvoSimControl.cs b/EvoNet/Controls/EvoSimControl.cs
index 8f00a0b..621f23d 100644
--- a/EvoNet/Controls/EvoSimControl.cs
+++ b/EvoNet/Controls/EvoSimControl.cs
@@ -135,10 +135,13 @@ protected override void Update(GameTime gameTime)
 
             foreach (var module in modules)
             {
-                module.NotifyTick((float)gameTime.ElapsedGameTime.TotalSeconds);
+                if (!inputManager.Paused || !module.WantsFastForward)
+                {
+                    module.NotifyTick((float)gameTime.ElapsedGameTime.TotalSeconds);
+                }
             }
-
-            if (inputManager.EnableFastForward)
+            
+            if (!inputManager.Paused && inputManager.EnableFastForward)
             {
                 DateTime startFastForward = DateTime.UtcNow;
                 double clampedElapsedTime = Math.Min(gameTime.ElapsedGameTime.TotalSeconds, 0.033);
diff --git a/EvoNet/EvoNet.csproj b/EvoNet/EvoNet.csproj
index d86ff87..32581d0 100644
--- a/EvoNet/EvoNet.csproj
+++ b/EvoNet/EvoNet.csproj
@@ -50,9 +50,6 @@
     <StartupObject>EvoNet.Program</StartupObject>
   </PropertyGroup>
   <ItemGroup>
-    <Reference Include="Microsoft.Build, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
-    <Reference Include="Microsoft.Build.Engine, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
-    <Reference Include="Microsoft.Build.Framework, Version=14.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL" />
     <Reference Include="Microsoft.Xna.Framework, Version=4.0.0.0, Culture=neutral, PublicKeyToken=842cf8be1de50553, processorArchitecture=x86" />
     <Reference Include="Microsoft.Xna.Framework.Game, Version=4.0.0.0, Culture=neutral, PublicKeyToken=842cf8be1de50553, processorArchitecture=x86" />
     <Reference Include="Microsoft.Xna.Framework.Graphics, Version=4.0.0.0, Culture=neutral, PublicKeyToken=842cf8be1de50553, processorArchitecture=x86" />
diff --git a/EvoNet/Input/InputManager.cs b/EvoNet/Input/InputManager.cs
index fbe4dd7..5493596 100644
--- a/EvoNet/Input/InputManager.cs
+++ b/EvoNet/Input/InputManager.cs
@@ -17,6 +17,7 @@ public class InputManager : UpdateModule
 
         bool rightMouseDown = false;
         bool oldSpaceDown = false;
+        bool oldEnterDown = false;
         Vector2 oldMousePosition = Vector2.Zero;
         int scrollWheelValue;
 
@@ -25,6 +26,7 @@ public class InputManager : UpdateModule
         SimulationRenderer renderer;
 
         public bool EnableFastForward { get; private set; }
+        public bool Paused { get; private set; }
 
         public override bool WantsFastForward
         {
@@ -76,6 +78,13 @@ protected override void Update(float gameTime)
                 EnableFastForward = !EnableFastForward;
             }
 
+            bool enterDown = keyboardState.IsKeyDown(Keys.Enter);
+
+            if (!oldEnterDown && enterDown)
+            {
+                Paused = !Paused;
+            }
+
             if (keyboardState.IsKeyDown(Keys.R))
             {
                 float viewportWidth = renderer.GraphicsDevice.Viewport.Width;
@@ -88,6 +97,7 @@ protected override void Update(float gameTime)
             }
 
             oldSpaceDown = spaceDown;
+            oldEnterDown = enterDown;
             scrollWheelValue = mouseState.ScrollWheelValue;
 
             oldMousePosition = new Vector2(mouseState.X, mouseState.Y);