Better scoring and map selection + Map delta

game/map.py

@@ -71,6 +71,12 @@ class Map:
     def to_type_dict(self):
         """Returns a matrix containing block types and None for empty spaces."""
         return [
-            [block.type if block is not None else None for block in row]
+            [self._visible_block_type(block) for block in row]
             for row in self.layout
-        ]
+        ]
+
+    @staticmethod
+    def _visible_block_type(block):
+        if block is None or getattr(block, "collected", False):
+            return None
+        return block.type