diff -r 8e31706fc5da -r 9cf895cde4bd minesweeper/src/main/java/org/apidesign/demo/minesweeper/MinesModel.java
--- a/minesweeper/src/main/java/org/apidesign/demo/minesweeper/MinesModel.java	Fri Feb 07 15:40:56 2014 +0100
+++ b/minesweeper/src/main/java/org/apidesign/demo/minesweeper/MinesModel.java	Fri Feb 07 16:35:45 2014 +0100
@@ -117,6 +117,7 @@
         List<Integer> xBombs = new ArrayList<Integer>();
         List<Integer> yBombs = new ArrayList<Integer>();
         final List<Row> rows = model.getRows();
+        boolean emptyHidden = false;
         for (int y = 0; y < rows.size(); y++) {
             final List<Square> columns = rows.get(y).getColumns();
             for (int x = 0; x < columns.size(); x++) {
@@ -127,6 +128,10 @@
                 }
                 if (sq.getState().isVisible()) {
                     sq.setState(SquareType.N_0);
+                } else {
+                    if (!sq.isMine()) {
+                        emptyHidden = true;
+                    }
                 }
             }
         }
@@ -136,6 +141,10 @@
             
             incrementAround(model, x, y);
         }
+        
+        if (!emptyHidden) {
+            model.setState(GameState.WON);
+        }
     }
     
     private static void incrementAround(Mines model, int x, int y) {