diff --git a/Metro/Metro_RP2350_Minesweeper/code.py b/Metro/Metro_RP2350_Minesweeper/code.py
index 3f1a19f36..6e4aeded2 100755
--- a/Metro/Metro_RP2350_Minesweeper/code.py
+++ b/Metro/Metro_RP2350_Minesweeper/code.py
@@ -197,13 +197,15 @@ def reset():
 def set_difficulty(diff):
     game_logic.difficulty = diff
     reset()
+    difficulty_menu.select_item(DIFFICULTIES[diff]['label'].lower().replace(" ", "_"))
 
 def hide_group(group):
     group.hidden = True
 
 for i, difficulty in enumerate(DIFFICULTIES):
     # Create a button for each difficulty
-    difficulty_menu.add_item((set_difficulty, i), difficulty['label'])
+    selected = i == game_logic.difficulty
+    difficulty_menu.add_item((set_difficulty, i), difficulty['label'], selected)
 
 reset_menu.add_item(reset, "OK")
 
diff --git a/Metro/Metro_RP2350_Minesweeper/gamelogic.py b/Metro/Metro_RP2350_Minesweeper/gamelogic.py
index 61a90b494..a66157898 100755
--- a/Metro/Metro_RP2350_Minesweeper/gamelogic.py
+++ b/Metro/Metro_RP2350_Minesweeper/gamelogic.py
@@ -68,8 +68,12 @@ def reset(self):
         if (self.grid_width * 16 > self._display.width or
             self.grid_height * 16 > self._display.height - INFO_BAR_HEIGHT):
             raise ValueError("Grid size exceeds display size")
-        self._board_data = bytearray(self.grid_width * self.grid_height)
         self._mine_count = DIFFICULTIES[self._difficulty]['mines']
+        if self._mine_count > (self.grid_width - 1) * (self.grid_height - 1):
+            raise ValueError("Too many mines for grid size")
+        if self._mine_count < 10:
+            raise ValueError("There must be at least 10 mines")
+        self._board_data = bytearray(self.grid_width * self.grid_height)
         self._status = STATUS_NEWGAME
         self._start_time = None
         self._end_time = None
@@ -241,7 +245,6 @@ def elapsed_time(self):
         if self._start_time is None:
             return 0
         if self._end_time is None:
-            print(ticks_ms() / 1000, self._start_time / 1000)
             return min(999, (ticks_ms() - self._start_time) // 1000)
         return min(999, (self._end_time - self._start_time) // 1000)
 
diff --git a/Metro/Metro_RP2350_Minesweeper/menu.py b/Metro/Metro_RP2350_Minesweeper/menu.py
index 4b397de72..1b1dc3109 100755
--- a/Metro/Metro_RP2350_Minesweeper/menu.py
+++ b/Metro/Metro_RP2350_Minesweeper/menu.py
@@ -36,17 +36,28 @@ def __init__(self, label, button_width, menu_width, x, y):
         self._menu_items = []
         self._root_button = None
 
-    def add_item(self, function, label):
+    def add_item(self, function, label, selected=False):
+        key = label.lower().replace(" ", "_")
         self._menu_items.append(
             {
+                "key": key,
                 "function": function,
                 "label": label,
+                "selected": selected,
             }
         )
         self._render()
 
+    def select_item(self, key):
+        for item in self._menu_items:
+            if item["key"] == key:
+                item["selected"] = True
+            else:
+                item["selected"] = False
+        self._render()
+
     @staticmethod
-    def _create_button(callback, label, width, x, y=0, border=True):
+    def _create_button(callback, label, width, x, y=0, border=True, selected=False):
         if border:
             outline_color = 0x000000
             selected_outline = 0x333333
@@ -54,6 +65,11 @@ def _create_button(callback, label, width, x, y=0, border=True):
             outline_color = 0xEEEEEE
             selected_outline = 0xBBBBBB
 
+        if selected:
+            selected_label = label_color = 0x008800
+        else:
+            selected_label = label_color = 0x333333
+
         button = EventButton(
             callback,
             x=x,
@@ -64,13 +80,14 @@ def _create_button(callback, label, width, x, y=0, border=True):
             style=EventButton.RECT,
             fill_color=0xEEEEEE,
             outline_color=outline_color,
-            label_color=0x333333,
+            label_color=label_color,
             selected_fill=0xBBBBBB,
-            selected_label=0x333333,
+            selected_label=selected_label,
             selected_outline=selected_outline,
         )
         return button
 
+
     def _toggle_submenu(self):
         self._menu_items_group.hidden = not self._menu_items_group.hidden
 
@@ -87,7 +104,7 @@ def _render(self):
             self._button_width,
             self._xpos,
             self._ypos,
-            border=True,
+            True,
         )
         self.append(self._root_button)
 
@@ -113,7 +130,8 @@ def _render(self):
                 self._menu_width - 2,
                 self._xpos + 1,
                 self._ypos + index * MENU_ITEM_HEIGHT + self._root_button.height,
-                border=False,
+                False,
+                item["selected"],
             )
             self._menu_items_group.append(button)