diff -r 9cf895cde4bd -r d41833895448 minesweeper/src/main/java/org/apidesign/demo/minesweeper/MinesModel.java
--- a/minesweeper/src/main/java/org/apidesign/demo/minesweeper/MinesModel.java	Fri Feb 07 16:35:45 2014 +0100
+++ b/minesweeper/src/main/java/org/apidesign/demo/minesweeper/MinesModel.java	Fri Feb 07 17:22:58 2014 +0100
@@ -57,7 +57,7 @@
         @ComputedProperty static String text(SquareType state) {
             if (state == null) return " ";
             switch (state) {
-                case MINE: return "B";
+                case EXPLOSION: return "B";
                 case UNKNOWN: return "?";
                 case N_0: return " ";
             }
@@ -70,17 +70,20 @@
     }
     
     enum SquareType {
-        
         N_0, N_1, N_2, N_3, N_4, N_5, N_6, N_7, N_8,
-        UNKNOWN, MINE;
+        UNKNOWN, EXPLOSION, DISCOVERED;
         
         final boolean isVisible() {
             return name().startsWith("N_");
         }
 
         final SquareType moreBombs() {
-            if (this == MINE || this == UNKNOWN) {
-                return this;
+            switch (this) {
+                case EXPLOSION:
+                case UNKNOWN:
+                case DISCOVERED:
+                case N_8:
+                    return this;
             }
             return values()[ordinal() + 1];
         }
@@ -144,6 +147,7 @@
         
         if (!emptyHidden) {
             model.setState(GameState.WON);
+            showAllBombs(model, SquareType.DISCOVERED);
         }
     }
     
@@ -170,11 +174,11 @@
         }
     }
     
-    static void showAllBombs(Mines model) {
+    static void showAllBombs(Mines model, SquareType state) {
         for (Row row : model.getRows()) {
             for (Square square : row.getColumns()) {
                 if (square.isMine()) {
-                    square.setState(SquareType.MINE);
+                    square.setState(state);
                 }
             }
         }
@@ -188,13 +192,49 @@
         switch (data.getState()) {
             case UNKNOWN: 
                 if (data.isMine()) {
-                    showAllBombs(model);
+                    showAllBombs(model, SquareType.EXPLOSION);
                     model.setState(GameState.LOST);
                 } else {
-                    data.setState(SquareType.N_0);
-                    model.computeMines();
+                    expandKnown(model, data);
                 }
             break;
         }
     }
+    private static void expandKnown(Mines model, Square data) {
+        final List<Row> rows = model.getRows();
+        for (int y = 0; y < rows.size(); y++) {
+            final List<Square> columns = rows.get(y).getColumns();
+            for (int x = 0; x < columns.size(); x++) {
+                Square sq = columns.get(x);
+                if (sq == data) {
+                    expandKnown(model, x, y);
+                    return;
+                }
+            }
+        }
+    }
+    private static void expandKnown(Mines model, int x , int y) {
+        if (y < 0 || y >= model.getRows().size()) {
+            return;
+        }
+        final List<Square> columns = model.getRows().get(y).getColumns();
+        if (x < 0 || x >= columns.size()) {
+            return;
+        }
+        final Square sq = columns.get(x);
+        if (sq.getState() == SquareType.UNKNOWN) {
+            sq.setState(SquareType.N_0);
+            model.computeMines();
+            if (sq.getState() == SquareType.N_0) {
+                expandKnown(model, x - 1, y - 1);
+                expandKnown(model, x - 1, y);
+                expandKnown(model, x - 1, y + 1);
+                expandKnown(model, x , y - 1);
+                expandKnown(model, x, y + 1);
+                expandKnown(model, x + 1, y - 1);
+                expandKnown(model, x + 1, y);
+                expandKnown(model, x + 1, y + 1);
+            }
+        }
+    }
 }