diff --git a/src/main/java/ch/zhaw/pm2/racetrack/Game.java b/src/main/java/ch/zhaw/pm2/racetrack/Game.java
index 85363e8..2136aed 100644
--- a/src/main/java/ch/zhaw/pm2/racetrack/Game.java
+++ b/src/main/java/ch/zhaw/pm2/racetrack/Game.java
@@ -25,12 +25,12 @@ public class Game implements GameSpecification {
 
     UserInterface userInterface;
 
-    public Game(String welcometext) {
-        userInterface = new UserInterface(welcometext);
+    public Game(UserInterface userInterface) {
+        this.userInterface = userInterface;
     }
 
 
-    public boolean initphase() throws InvalidTrackFormatException, FileNotFoundException {
+    public boolean initPhase() throws InvalidTrackFormatException, FileNotFoundException {
         File folder = new File("tracks");
         File[] listOfFiles = folder.listFiles();
         if(listOfFiles.length > 0) {
@@ -154,7 +154,33 @@ public class Game implements GameSpecification {
     @Override
     public void doCarTurn(Direction acceleration) {
         // TODO: implementation
-        throw new UnsupportedOperationException();
+        track.getCar(currentCarIndex).accelerate(acceleration);
+
+        PositionVector crashPosition = null;
+        List<PositionVector> positionList  = calculatePath(track.getCarPos(currentCarIndex),track.getCar(currentCarIndex).nextPosition());
+        //TODO: check if Method calculatePath contains endposition
+        for(PositionVector location : positionList) { //todo: check if order must be reversed
+            if(willCarCrash(currentCarIndex, location)) {
+                crashPosition = location;
+            }
+        }
+        if(crashPosition != null) {
+            track.carDoesCrash(currentCarIndex, crashPosition);
+        }
+        else {
+            track.getCar(currentCarIndex).move();
+        }
+    }
+
+    public void gamePhase() {
+        do{
+            userInterface.printTrack(track);
+            doCarTurn(userInterface.selectDirection(currentCarIndex, track.getCarId(currentCarIndex)));
+            if(getWinner() != NO_WINNER) {
+                return;
+            }
+        } while (!allCarsCrashed());
+
     }
 
     /**
@@ -190,7 +216,7 @@ public class Game implements GameSpecification {
         int y = startPosition.getY();
 
         // Relative Distance (x & y axis) between end- and starting position
-        int diffX = endPosition.getX() - startPosition.getY();
+        int diffX = endPosition.getX() - startPosition.getX();
         int diffY = endPosition.getY() - startPosition.getY();
 
         // Absolute distance (x & y axis) between end- and starting position
@@ -248,14 +274,15 @@ public class Game implements GameSpecification {
      */
     @Override
     public boolean willCarCrash(int carIndex, PositionVector position) {
+        return track.willCrashAtPosition(position); //TODO: add carIndex
+    }
 
-        List<PositionVector> positionList  = calculatePath(track.getCarPos(carIndex),position);
-        for(PositionVector location : positionList) {
-            if(track.willCrashAtPosition(location)) {
-                return true;
+    public boolean allCarsCrashed() {
+        for(int carIndex = 0; carIndex < track.getCarCount(); carIndex ++) {
+            if(! track.getCar(carIndex).isCrashed()) {
+                return false;
             }
         }
-        return false;
-
+        return true;
     }
 }