diff --git a/bintree.c b/bintree.c
index 1b8aa4c..6eece17 100644
--- a/bintree.c
+++ b/bintree.c
@@ -66,12 +66,36 @@ TreeNode *addToTree(TreeNode *root, const void *data, size_t dataSize, CompareFc
 // push the top node and push all its left nodes.
 void *nextTreeData(TreeNode *root)
 {
-  if(root == NULL)
+    static StackNode *stack = NULL;
+
+    // Beim ersten Aufruf: ganzen linken Pfad pushen
+    if(root != NULL)
     {
-
-
+      while(root != NULL)
+      {
+        stack = push(stack, root);      // TreeNode auf den Stack
+        root = root->left;
+      }
     }
-  stackNode.top(root);
+
+    // Wenn Stack leer -> fertig
+    if(stack == NULL)
+      return NULL;
+
+    // Obersten Knoten holen
+    TreeNode *node = (TreeNode*) top(stack);
+    stack = pop(stack);
+
+    // Rechten Teilbaum absteigen
+    TreeNode *right = node->right;
+    while(right != NULL)
+    {
+      stack = push(stack, right);
+      right = right->left;
+    }
+
+    return node->data;
+
 }
 
 // Releases all memory resources (including data copies).
diff --git a/doble_initial.exe b/doble_initial.exe
index 1162fb9..71ee97f 100644
Binary files a/doble_initial.exe and b/doble_initial.exe differ
diff --git a/highscores.txt b/highscores.txt
index 0edaa84..67b8a3c 100644
--- a/highscores.txt
+++ b/highscores.txt
@@ -1,2 +1,3 @@
 Silvana;9944
+hannes;9910
 player1;3999