diff --git a/src/main/scala/ScalaGo/REPL.scala b/src/main/scala/ScalaGo/REPL.scala
index 23b2191..a5e746c 100644
--- a/src/main/scala/ScalaGo/REPL.scala
+++ b/src/main/scala/ScalaGo/REPL.scala
@@ -18,6 +18,7 @@ object REPL:
   def repl(endState: GameState): Unit =
     while gs != endState
     do
+
         ???
 
   /**
diff --git a/src/main/scala/ScalaGo/SimpleList.scala b/src/main/scala/ScalaGo/SimpleList.scala
index 25acc7b..0236a4c 100644
--- a/src/main/scala/ScalaGo/SimpleList.scala
+++ b/src/main/scala/ScalaGo/SimpleList.scala
@@ -17,7 +17,10 @@ object SimpleList:
    * @param list the list
    * @param item append this item
    */
-  def append[A](list: SimpleList[A], item: A): Unit = ???
+  def append[A](list: SimpleList[A], item: A): Unit = {
+    var l = SimpleList(item, list)
+    return l
+  }
 
   /**
    * Determines the length of the SimpleList.
@@ -25,7 +28,15 @@ object SimpleList:
    * @param list the list
    * @return the length
    */
-  def length[A](list: SimpleList[A]): Int = ???
+  def length[A](list: SimpleList[A]): Int = {
+    var l = list
+    var counter: Int = 0
+    while l != null do {
+      counter = counter + 1
+      l = l.next
+    }
+    return counter
+  }
 
   /**
    * Tests if the SimpleList contains a given element.
@@ -36,4 +47,13 @@ object SimpleList:
    * @param item search for this item
    * @return true if the SimpleList contains the item, false if not
    */
-  def contains[A](list: SimpleList[A], item: A): Boolean = ???
+  def contains[A](list: SimpleList[A], item: A): Boolean = {
+    var l = list
+    while l != null do {
+      if (l.entry == item) then {
+        return true
+      }
+      l = l.next
+    }
+    return false
+  }