diff --git a/src/main/java/ch/fritteli/labyrinth/Direction.java b/src/main/java/ch/fritteli/labyrinth/Direction.java
index 217f51a..f9d3b76 100644
--- a/src/main/java/ch/fritteli/labyrinth/Direction.java
+++ b/src/main/java/ch/fritteli/labyrinth/Direction.java
@@ -1,11 +1,7 @@
 package ch.fritteli.labyrinth;
 
-import io.vavr.collection.Stream;
-import io.vavr.control.Option;
 import lombok.NonNull;
 
-import java.util.EnumSet;
-import java.util.Random;
 import java.util.function.UnaryOperator;
 
 public enum Direction {
@@ -13,7 +9,7 @@ public enum Direction {
     BOTTOM(position -> position.withY(position.getY() + 1)),
     LEFT(position -> position.withX(position.getX() - 1)),
     RIGHT(position -> position.withX(position.getX() + 1));
-    private static final Random random = new Random();
+
     @NonNull
     private final UnaryOperator<Position> translation;
 
@@ -21,23 +17,7 @@ public enum Direction {
         this.translation = translation;
     }
 
-    public static Direction getRandom() {
-        return values()[random.nextInt(4)];
-    }
-
-    public static Option<Direction> getRandomExcluding(@NonNull final EnumSet<Direction> directions) {
-        final EnumSet<Direction> allowedDirections = EnumSet.complementOf(directions);
-        return Stream.ofAll(allowedDirections).shuffle().headOption();
-    }
-
-    public static Option<Direction> getRandomExcluding(@NonNull final Direction... directions) {
-        return Stream.of(values())
-                .removeAll(Stream.of(directions))
-                .shuffle()
-                .headOption();
-    }
-
-    public Direction getOpposite() {
+    public Direction invert() {
         switch (this) {
             case TOP:
                 return BOTTOM;
@@ -48,7 +28,7 @@ public enum Direction {
             case BOTTOM:
                 return TOP;
         }
-        throw new IllegalStateException("Programming error: Not all enum values covered in enum Direction#getOpposite()!");
+        throw new IllegalStateException("Programming error: Not all enum values covered in enum Direction#invert()!");
     }
 
     public Position translate(@NonNull final Position position) {
diff --git a/src/main/java/ch/fritteli/labyrinth/Labyrinth.java b/src/main/java/ch/fritteli/labyrinth/Labyrinth.java
index 553087c..c8baa80 100644
--- a/src/main/java/ch/fritteli/labyrinth/Labyrinth.java
+++ b/src/main/java/ch/fritteli/labyrinth/Labyrinth.java
@@ -78,7 +78,7 @@ public class Labyrinth {
                 final Option<Direction> directionToDigTo = currentTile.getRandomAvailableDirection();
                 if (directionToDigTo.isDefined()) {
                     final Direction digTo = directionToDigTo.get();
-                    final Direction digFrom = digTo.getOpposite();
+                    final Direction digFrom = digTo.invert();
                     final Position neighborPosition = digTo.translate(currentPosition);
                     final Tile neighborTile = Labyrinth.this.getTileAt(neighborPosition);
                     if (currentTile.digTo(digTo) && neighborTile.digFrom(digFrom)) {