diff --git a/src/schack/King.java b/src/schack/King.java
index 61f524d..466f4d8 100644
--- a/src/schack/King.java
+++ b/src/schack/King.java
@@ -4,6 +4,7 @@ import java.awt.Point;
 import java.io.IOException;
 import java.util.ArrayList;
 import java.util.LinkedHashSet;
+import javax.swing.text.Position;
 
 public final class King extends PieceKnownIfMoved {
 
@@ -18,6 +19,69 @@ public final class King extends PieceKnownIfMoved {
         return true;
     }
 
+    private void addCastlingIfCan(Piece[][] pieces, LinkedHashSet<Point> movable, Point toMove, Point selected) {
+        if (hasMoved) {
+            return;
+        }
+
+        // Vänster
+        boolean nothingInBetween = true;
+        for (int loopX = this.position.x - 1; loopX >= 0; loopX--) {
+
+            // Kolla ifall vi kollar tornet och inget är emellan
+            if (loopX == 0 && nothingInBetween) {
+                movable.add(new Point(2, this.position.y));
+            }
+
+            // Kolla ifall det är tomt emellan kung och torn
+            if (pieces[loopX][this.position.y] != null) {
+                nothingInBetween = false;
+            }
+
+        }
+
+        // Höger
+        for (int loopX = this.position.x + 1; loopX <= 7; loopX++) {
+
+            // Kolla ifall vi kollar tornet och inget är emellan
+            if (loopX == 7 && nothingInBetween) {
+                movable.add(new Point(6, this.position.y));
+            }
+
+            // Kolla ifall det är tomt emellan kung och torn
+            if (pieces[loopX][this.position.y] != null) {
+                nothingInBetween = false;
+            }
+        }
+
+    }
+
+    private void castle(Piece[][] pieces, boolean left) {
+
+        Piece rook = pieces[left ? 0 : 7][this.position.y];
+        Piece king = this;
+
+        // Null där de stod
+        pieces[king.position.x][king.position.y] = null;
+        pieces[rook.position.x][rook.position.y] = null;
+        // Uppdatera internt minne
+        king.position.x = left ? 2 : 6;
+        rook.position.x = left ? 3 : 5;
+        // Uppdatera brädet
+        pieces[king.position.x][king.position.y] = king;
+        pieces[rook.position.x][rook.position.y] = rook;
+    }
+
+    @Override
+    public void move(Piece[][] pieces, Point toMove, Point selected) {
+        if (Math.abs(selected.x - toMove.x) == 2) {
+            castle(pieces, isWhite);
+        } else {
+            super.move(pieces, toMove, selected);
+        }
+
+    }
+
     @Override
     public LinkedHashSet<Point> validMoves(Piece[][] pieces) {
         LinkedHashSet<Point> movable = new LinkedHashSet<>();
@@ -31,6 +95,7 @@ public final class King extends PieceKnownIfMoved {
             }
 
         }
+        addCastlingIfCan(pieces, movable, position, position);
         return movable;
     }
 
diff --git a/src/schack/Piece.java b/src/schack/Piece.java
index 3044abd..4868214 100644
--- a/src/schack/Piece.java
+++ b/src/schack/Piece.java
@@ -58,7 +58,7 @@ public abstract class Piece {
 
         }
     }
-
+    
     protected boolean addMovesIfCan(Point pos, LinkedHashSet movable, Piece[][] pieces) {
         // Instead of checking index and null, try-catch
         try {
diff --git a/src/schack/PieceKnownIfMoved.java b/src/schack/PieceKnownIfMoved.java
index 50500d4..6ee0718 100644
--- a/src/schack/PieceKnownIfMoved.java
+++ b/src/schack/PieceKnownIfMoved.java
@@ -22,4 +22,8 @@ public abstract class PieceKnownIfMoved extends Piece {
         hasMoved = true;
     }
 
+    public boolean hasMoved() {
+        return hasMoved;
+    }
+
 }