diff --git a/source/code/BlockGame.hpp b/source/code/BlockGame.hpp
index 5696af2..74f7470 100644
--- a/source/code/BlockGame.hpp
+++ b/source/code/BlockGame.hpp
@@ -143,7 +143,7 @@ public:
 	Uint8 getAIlevel();
 	
 	virtual void AddText(int x, int y, const std::string& text, int time) {};
-	virtual void AddBall(int x, int y, bool left, int color) {};
+	virtual void AddBall(int x, int y, bool right, int color) {};
 	virtual void AddExplosion(int x, int y) {};
 	
 	int GetScore();
diff --git a/source/code/main.cpp b/source/code/main.cpp
index e3d12ce..91ef68f 100644
--- a/source/code/main.cpp
+++ b/source/code/main.cpp
@@ -1262,10 +1262,10 @@ public:
 		SDL_FreeSurface(sBoard);
 	}
 	
-	int GetTopX() {
+	int GetTopX() const {
 		return topx;
 	}
-	int GetTopY() {
+	int GetTopY() const {
 		return topy;
 	}
 	
@@ -1273,7 +1273,7 @@ public:
 		theTextManeger.addText(topx-10+x*bsize, topy+12*bsize-y*bsize, text, time);
 	}
 	
-	void AddBall(int x, int y, bool left, int color) override {
+	void AddBall(int x, int y, bool right, int color) override {
 		theBallManeger.addBall(topx+40+x*bsize, topy+bsize*12-y*bsize, left, color);
 	}