diff -r f1d7de36b01e -r 5179eff8a9b6 src/de/uapcore/sudoku/Field.java
--- a/src/de/uapcore/sudoku/Field.java	Sat Jan 26 15:48:59 2013 +0100
+++ b/src/de/uapcore/sudoku/Field.java	Sat Jan 26 17:42:07 2013 +0100
@@ -13,7 +13,7 @@
  *
  * @author mike
  */
-public class Field extends JPanel {
+public final class Field extends JPanel {
     private SudokuTextField[][] cells;
     
     public Field() {
@@ -66,5 +66,30 @@
         graphics.drawImage(img, 0, 0, this);
     }
     
+    public int getCellValue(int x, int y) {
+        return cells[x][y].getValue();
+    }
     
+    public void setCellValue(int x, int y, int v) {
+        cells[x][y].setValue(v);
+    }
+    
+    public void setAllCellsModified(boolean modified) {
+        for (int x = 0 ; x < 9 ; x++) {
+            for (int y = 0 ; y < 9 ; y++) {
+                cells[x][y].setModified(modified);
+            }
+        }
+    }
+    
+    public boolean isAnyCellModified() {
+        for (int x = 0 ; x < 9 ; x++) {
+            for (int y = 0 ; y < 9 ; y++) {
+                if (cells[x][y].isModified()) {
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
 }