Make sure scores are int only.

__init__.py

@@ -95,11 +95,11 @@ class Scoreboard:
         
     def decrease_score(self, points=1):
         """Decrease the current score."""
-        self.currentScore -= points
+        self.currentScore -= int(points)
         
     def increase_score(self, points=1):
         """Increase the current score."""
-        self.currentScore += points
+        self.currentScore += int(points)
         
     def check_high_score(self):
         """Check if current score qualifies as a high score.