diff --git a/Playzing.py b/Playzing.py
index 8f545a4..ee56f88 100755
--- a/Playzing.py
+++ b/Playzing.py
@@ -24,6 +24,12 @@ class Playzing(pgfw.Game):
         """
         pgfw.Game.__init__(self)
 
+        # Member dict for tracking pin state changes. Start at 1 because high means unpressed.
+        self.pin_states = {
+            self.PIN_BUTTON_LEFT: 1,
+            self.PIN_BUTTON_RIGHT: 1
+        }
+
         # Assign types to configuration values
         self.configuration.type_declarations.add_chart({
             "display":