diff --git a/CMakeLists.txt b/CMakeLists.txt
index ab41ea2..c4bcfb9 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -42,7 +42,7 @@ add_definitions(-DLOCALEDIR=\"${CMAKE_INSTALL_PREFIX}/${INSTALL_LOCALE_DIR}\")
 endif()
 
 #Compiler options
-set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -std=c++11")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wextra -std=c++11")
 set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_DEBUG} -g -DDEBUG")
 set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} ${CMAKE_CXX_FLAGS_RELEASE} -O2")
 
diff --git a/source/code/BlockGame.hpp b/source/code/BlockGame.hpp
index 5436780..2c233e4 100644
--- a/source/code/BlockGame.hpp
+++ b/source/code/BlockGame.hpp
@@ -219,9 +219,9 @@ public:
 
 	int getAIlevel()  const;
 	
-	virtual void AddText(int x, int y, const std::string& text, int time) const  {}
-	virtual void AddBall(int x, int y, bool right, int color) const  {}
-	virtual void AddExplosion(int x, int y) const  {}
+	virtual void AddText(int, int, const std::string&, int) const  {}
+	virtual void AddBall(int, int, bool, int) const  {}
+	virtual void AddExplosion(int, int) const  {}
 	virtual void PlayerWonEvent() const  {}
 	virtual void DrawEvent() const {}
 	virtual void BlockPopEvent() const  {}
diff --git a/source/code/main.cpp b/source/code/main.cpp
index c8a8318..0e675a8 100644
--- a/source/code/main.cpp
+++ b/source/code/main.cpp
@@ -1054,7 +1054,7 @@ static void StartSinglePlayerTimeTrial() {
 	saveReplay = true;
 }
 
-static int StartSinglePlayerPuzzle(int level) {
+static int StartSinglePlayerPuzzle() {
 	BlockGameStartInfo startInfo;
 	startInfo.ticks = SDL_GetTicks();
 	startInfo.puzzleMode = true;
@@ -1565,7 +1565,7 @@ int runGame(Gametype gametype, int level) {
 				}
 				break;
 				case Gametype::Puzzle:
-					if (StartSinglePlayerPuzzle(level)) {
+					if (StartSinglePlayerPuzzle()) {
 						return 1;
 					}
 					break;