diff --git a/src/Game.cpp b/src/Game.cpp
index 99a765c..a5d8a6c 100644
--- a/src/Game.cpp
+++ b/src/Game.cpp
@@ -24,8 +24,7 @@ void Game::update(float dTime) {
 }
 
 void Game::tryCreateWall() {
-	int val = rand() % 1000;
-	if (val > 990){
+	if (Game::Random(0, 1000) > 990){
 		walls.emplace_back();
 	}
 }
@@ -47,3 +46,10 @@ Game::Game() {
 GameQueue * Game::eventQueue = new GameQueue;
 Game * Game::instance = nullptr;
 
+double Game::Random(double low, double high) {
+	std::random_device device;
+	std::mt19937 gen(device());
+	auto dist = std::uniform_real_distribution<double>(low, high);
+	return dist(gen);
+}
+
diff --git a/src/Game.h b/src/Game.h
index 5256741..205adc8 100644
--- a/src/Game.h
+++ b/src/Game.h
@@ -18,6 +18,7 @@ class Game {
 	void tryCreateWall();
 	void removeWalls();
 public:
+	static double Random(double low, double high);
 	Window * window = nullptr;
 	// seconds
 	float eTime = 0;
diff --git a/src/Player.cpp b/src/Player.cpp
index 5b454bd..d050620 100644
--- a/src/Player.cpp
+++ b/src/Player.cpp
@@ -50,6 +50,6 @@ void Player::update(float dTime, std::vector<Wall> &walls) {
 }
 
 void Player::jump() {
-	vel += {0, -300};
+	vel += {0, -jumpPower};
 	Audio::playSound(1, SOUND_JUMP);
 }
diff --git a/src/Player.h b/src/Player.h
index 8022301..1510da9 100644
--- a/src/Player.h
+++ b/src/Player.h
@@ -10,6 +10,8 @@ class Player : public InputListener {
 	QVector2D vel {};
 	QVector2D acc {0, 9.81 * 30};
 
+	static constexpr float jumpPower = 400;
+
 	void jump();
 public:
 	void draw(QPainter &painter) const;
diff --git a/src/Wall.cpp b/src/Wall.cpp
index 3cd32b9..270331d 100644
--- a/src/Wall.cpp
+++ b/src/Wall.cpp
@@ -18,7 +18,7 @@ void Wall::update(float dTime) {
 
 Wall::Wall() {
 	pos = {WIDTH, GROUND_Y};
-	size = {50, 50};
+	size = QSize(int(Game::Random(30, 60)), int(Game::Random(30, 150)));
 }
 
 bool Wall::isLost() const {