Use the debugPrint command so that it does not happen in production.

Pass the board directly rather than with an intermediate variable.

lib/main.dart

@@ -11,7 +11,7 @@ class MyLogger {
     if (method.isNotEmpty) {
       stdout.write(" - $method");
     }
-    print(": $output");
+    debugPrint(": $output");
   }
 }
 
@@ -291,12 +291,10 @@ class PlayerSpot extends StatefulWidget {
 }
 
 class _PlayerSpotState extends State<PlayerSpot> {
-  List<int> BOARD = [];
   int _spot = -2;
 
   @override
   void initState() {
-    BOARD = widget.board;
     _spot = widget.spot;
     super.initState();
   }
@@ -307,7 +305,7 @@ class _PlayerSpotState extends State<PlayerSpot> {
       w: 50,
       h: 100,
       spot: _spot,
-      board: BOARD,
+      board: widget.board,
       boardUpdate: null,
     );
   }