diff --git a/src/game/Clock.java b/src/game/Clock.java
index 8e12838..c4cdf14 100644
--- a/src/game/Clock.java
+++ b/src/game/Clock.java
@@ -5,29 +5,41 @@ import gui.GUI;
 import java.util.Timer;
 import java.util.TimerTask;
 
-public class Clock extends Thread{
+public class Clock extends Thread {
 
+    private Control control;
+    private GUI gui;
     private boolean running = true;
+    private int velocity;
+    private Timer t;
+    private TimerTask tt;
 
-    public void start(Control control, GUI gui, int velocity){
+    public Clock(Control control, GUI gui, int velocity) {
+        this.control = control;
+        this.gui = gui;
+        this.velocity = velocity;
+    }
 
+    public void start() {
 
-        Timer t = new Timer();
-        TimerTask tt = new TimerTask() {
+        if (t == null) {
+            t = new Timer();
+        }
+
+        tt = new TimerTask() {
             @Override
             public void run() {
-                if (running){
+                if (running) {
                     control.showGrid(control.getCells());
                     control.nextGen();
                 }
             }
         };
-        t.scheduleAtFixedRate(tt, 0, velocity);
 
+        t.scheduleAtFixedRate(tt, 0, this.velocity);
     }
 
 
-
     public boolean isRunning() {
         return running;
     }
@@ -36,5 +48,15 @@ public class Clock extends Thread{
         this.running = running;
     }
 
+
+    public int getVelocity() {
+        return velocity;
+    }
+
+    public void setVelocity(int velocity) {
+        this.velocity = velocity;
+        start();
+    }
+
 }
 
diff --git a/src/game/Control.java b/src/game/Control.java
index 7f35f81..204692a 100644
--- a/src/game/Control.java
+++ b/src/game/Control.java
@@ -9,7 +9,7 @@ public class Control {
     private GUI gui;
     private Clock clock;
 
-    private int xSize, ySize, cellCount, gen = 0;
+    private int xSize, ySize, cellCount, gen;
 
     private boolean[][] cells;
     private boolean[][] newcells;
@@ -22,14 +22,14 @@ public class Control {
 
     public void start() {
 
-        clock = new Clock();
+        clock = new Clock(this, gui, 1000);
         gui = new GUI(this);
         gui.createMenuWindow();
 
     }
 
     public void startGame() {
-        clock.start(this, gui, 200);
+        clock.start();
     }
 
     public void buildGameWindow(int xSize, int ySize, int cellCount, StartMode startMode) {
@@ -37,6 +37,8 @@ public class Control {
         this.ySize = ySize;
         this.cellCount = cellCount;
 
+        gen = 0;
+
         cells = new boolean[this.xSize][this.ySize];
         newcells = new boolean[this.xSize][this.ySize];
 
@@ -279,6 +281,10 @@ public class Control {
     public boolean isRunning(){
         return clock.isRunning();
     }
+
+    public void setVelocity(int velocity){
+        clock.setVelocity(velocity);
+    }
 }
 
 
diff --git a/src/gui/ControlWindow.java b/src/gui/ControlWindow.java
index ff04a27..857fec9 100644
--- a/src/gui/ControlWindow.java
+++ b/src/gui/ControlWindow.java
@@ -1,11 +1,12 @@
 package gui;
 
 import javax.swing.*;
+import javax.swing.event.ChangeEvent;
+import javax.swing.event.ChangeListener;
+import javax.swing.event.DocumentEvent;
+import javax.swing.event.DocumentListener;
 import java.awt.*;
-import java.awt.event.ActionEvent;
-import java.awt.event.ActionListener;
-import java.awt.event.WindowAdapter;
-import java.awt.event.WindowEvent;
+import java.awt.event.*;
 
 public class ControlWindow {
 
@@ -13,6 +14,12 @@ public class ControlWindow {
     private JFrame controlWindow;
     private JButton toggleGame;
 
+    private int maxVelocity = 1 , minVelocity = 10000;
+
+    private JSlider velocitySlider;
+    private JLabel velocitySliderName;
+    private JTextField velocitySliderLabel;
+
     private GUI gui;
 
     public ControlWindow(GameWindow gameWindow, GUI gui, int offset) {
@@ -51,6 +58,7 @@ public class ControlWindow {
             public void actionPerformed(ActionEvent e) {
                 gui.setRunning(!gui.isRunning());
                 updateToggleButton();
+                setVelocity(100);
             }
         });
 
@@ -59,6 +67,71 @@ public class ControlWindow {
 
     }
 
+    private void initVelocity(Font text){
+        velocitySlider = new JSlider(minVelocity, maxVelocity);
+        velocitySlider.setBounds(180, 110, 200, 20);
+        velocitySlider.setFont(text);
+        velocitySlider.setForeground(Color.decode("#121212"));
+        velocitySlider.setValue(6);
+        velocitySlider.addChangeListener(new ChangeListener() {
+            @Override
+            public void stateChanged(ChangeEvent e) {
+                if(!sliderLocked) {
+                    xAxisSize = velocitySlider.getValue();
+                    updateSliderLabels(0, xAxisSize);
+                    updateStartCells();
+                }
+            }
+        });
+        velocitySlider.setVisible(true);
+
+
+        xAxisName = new JLabel("Breite in Zellen:");
+        xAxisName.setBounds(50, 100, 200, 30);
+        xAxisName.setFont(text);
+        xAxisName.setForeground(Color.decode("#121212"));
+        xAxisName.setVisible(true);
+
+        xAxisLabel = new JTextField("6");
+        xAxisLabel.setBackground(null);
+        xAxisLabel.setBorder(null);
+        xAxisLabel.setBounds(180, 80, 200, 30);
+        xAxisLabel.setFont(text);
+        xAxisLabel.setForeground(Color.decode("#121212"));
+        xAxisLabel.setVisible(true);
+        xAxisLabel.addKeyListener(new KeyAdapter() {
+            public void keyTyped(KeyEvent evt) {
+                if (!Character.isDigit(evt.getKeyChar())) {
+                    evt.consume();
+                }
+            }
+        });
+
+        xAxisLabel.getDocument().addDocumentListener(new DocumentListener() {
+            @Override
+            public void insertUpdate(DocumentEvent e) {
+
+                sliderLocked = true;
+                String s = xAxisLabel.getText();
+                velocitySlider.setValue(Integer.parseInt(s));
+                xAxisSize = velocitySlider.getValue();
+                updateStartCells();
+                sliderLocked = false;
+            }
+
+            @Override
+            public void removeUpdate(DocumentEvent e) {
+
+            }
+
+            @Override
+            public void changedUpdate(DocumentEvent e) {
+
+            }
+        });
+    }
+
+
     public void setVisibility(boolean value) {
         controlWindow.setVisible(value);
     }
@@ -75,4 +148,8 @@ public class ControlWindow {
         controlWindow.dispose();
     }
 
+
+    public void setVelocity(int velocity){
+        gui.setVelocity(velocity);
+    }
 }
diff --git a/src/gui/GUI.java b/src/gui/GUI.java
index 5a08560..407565c 100644
--- a/src/gui/GUI.java
+++ b/src/gui/GUI.java
@@ -59,6 +59,9 @@ public class GUI {
         return menuWindow;
     }
 
+    public void setVelocity(int velocity){
+        control.setVelocity(velocity);
+    }
 
     //TODO: Delet this Methods. Those are shit.
     public void setVisibility(boolean value){
diff --git a/src/gui/GameWindow.java b/src/gui/GameWindow.java
index e7c128f..ef33205 100644
--- a/src/gui/GameWindow.java
+++ b/src/gui/GameWindow.java
@@ -41,6 +41,7 @@ public class GameWindow {
                     gui.getControlWindow().dispose();
                 }
                 gameWindow.dispose();
+                gui.setRunning(false);
                 gui.getMenuWindow().setVisibility(true);
             }
         });