diff --git a/source/Game.cpp b/source/Game.cpp
index 7c5fd37..7752c9f 100644
--- a/source/Game.cpp
+++ b/source/Game.cpp
@@ -26,18 +26,15 @@ const float Game::TICKS_GOAL = 1000 / Game::FPS_GOAL;
  * Initializes game, including window and objects (sprites).
  */
 Game::Game(sf::RenderWindow& window) :
-		mWorld(b2Vec2(0, 0)),
 		mWindow(window),
 		mView(Vector2f(0, 0), mWindow.getView().getSize()),
 		//mFps("test"),
-		mTileManager(mWorld),
-		mPathfinder(mTileManager),
+		mTileManager(mWorld),
 		mElapsed(0),
 		mQuit(false),
 		mPaused(false) {
 	mWindow.setFramerateLimit(FPS_GOAL);
-	mWindow.setKeyRepeatEnabled(true);
-	mWorld.SetContactListener(this);
+	mWindow.setKeyRepeatEnabled(true);
 
 	generate();
 }
@@ -83,7 +80,7 @@ Game::loop() {
 
 		for (; !mPaused && (left >= TICKS_GOAL); left -= TICKS_GOAL) {
 			Character::think(TICKS_GOAL);
-			mWorld.Step(1.0f / FPS_GOAL, 8, 3);
+			mWorld.step();
 
 			mCollection.checkDelete();
 		}
@@ -245,19 +242,3 @@ String
 Game::getFps() {
 	return str((mElapsed != 0) ? 1000.0f / mElapsed : 0.0f, 2);
 }
-
-/**
- * Begin of collision, call callback function on both objects.
- */
-void
-Game::BeginContact(b2Contact* contact) {
-	Body& first = *static_cast<Body*>(contact->GetFixtureA()->GetBody()->GetUserData());
-	Body& second = *static_cast<Body*>(contact->GetFixtureB()->GetBody()->GetUserData());
-
-	if (!first.doesCollide(second) || !second.doesCollide(first)) {
-		contact->SetEnabled(false);
-		return;
-	}
-	first.onCollide(second, second.getCategory());
-	second.onCollide(first, first.getCategory());
-}
diff --git a/source/Game.h b/source/Game.h
index 4def72a..0f6cab3 100644
--- a/source/Game.h
+++ b/source/Game.h
@@ -13,28 +13,27 @@
 
 #include <Thor/Resources.hpp>
 
-#include <Box2D/Box2D.h>
-
+#include "World.h"
 #include "sprites/TileManager.h"
 #include "sprites/Player.h"
 #include "types/String.h"
 #include "util/Collection.h"
 #include "util/Pathfinder.h"
 
+class World;
 class Player;
 class Collection;
 
 /*
  * Use vertex for tiles.
  */
-class Game : private sf::NonCopyable, public b2ContactListener {
+class Game : private sf::NonCopyable {
 // Public functions.
 public:
 	Game(sf::RenderWindow& window);
 	~Game();
 
 	void loop();
-    void BeginContact(b2Contact* contact);
 
 // Private functions.
 private:
@@ -55,7 +54,7 @@ private:
 	static const int FPS_GOAL;
 	static const float TICKS_GOAL;
 
-	b2World mWorld;
+	World mWorld;
 
 	sf::RenderWindow& mWindow;
 	sf::Clock mClock;
diff --git a/source/abstract/Body.cpp b/source/abstract/Body.cpp
index a23292c..f9bdb69 100755
--- a/source/abstract/Body.cpp
+++ b/source/abstract/Body.cpp
@@ -21,63 +21,19 @@ const Vector2i Body::DEFAULT_SIZE = Vector2i(50, 50);
  */
 Body::Body(const PhysicalData& data, const Yaml& config, const Vector2i& pSize) :
 		mDelete(false) {
-	Vector2i size = (pSize == Vector2i())
-		? config.get(KEY_SIZE, DEFAULT_SIZE)
-		: pSize;
-	assert(size != Vector2i());
-
-	b2BodyDef bodyDef;
-	bodyDef.type = (data.moving)
-						? b2_dynamicBody
-						: b2_staticBody;
-	bodyDef.position = vector(data.position);
-	bodyDef.allowSleep = true;
-	bodyDef.fixedRotation = true;
-	bodyDef.bullet = data.bullet;
-	bodyDef.userData = this;
-
-	mBody = data.world.CreateBody(&bodyDef);
-
-	b2Shape* shape;
-	if (data.circle) {
-		assert(size.x == size.y);
-		shape = new b2CircleShape;
-		shape->m_radius = pixelToMeter(size.x) / 2;
-	}
-	else {
-		b2PolygonShape* box = new b2PolygonShape;
-		box->SetAsBox(pixelToMeter(size.x) / 2,
-				      pixelToMeter(size.y) / 2);
-		shape = dynamic_cast<b2Shape*>(box);
-	}
-
-	b2FixtureDef fixtureDef;
-	fixtureDef.shape = shape;
-	fixtureDef.density = 1.0f;
-	fixtureDef.filter.categoryBits = data.category;
-	fixtureDef.filter.maskBits = ~data.maskExclude;
-	fixtureDef.restitution = 0;
-	fixtureDef.density = (data.bullet) ? 0 : 10000;
-
-	mBody->CreateFixture(&fixtureDef);
-
-	delete shape;
 }
 
 /**
- * Removes body from world.
+ * Used to make this class pure virtual without any pure virtual function.
  */
 Body::~Body() {
-	mBody->GetWorld()->DestroyBody(mBody);
 }
 
 /**
  * Initializes container.
- *
- * @link Physical::PhysicalData
  */
-Body::PhysicalData::PhysicalData( const Vector2f& position, b2World& world, uint16 category,
-	uint16 maskExclude, bool moving, bool bullet, bool circle) :
+Body::PhysicalData::PhysicalData( const Vector2f& position, World& world, Category category,
+	unsigned short maskExclude, bool moving, bool bullet, bool circle) :
 		position(position),
 		world(world),
 		category(category),
@@ -92,7 +48,7 @@ Body::PhysicalData::PhysicalData( const Vector2f& position, b2World& world, uint
  */
 Vector2f
 Body::getPosition() const {
-	return vector(mBody->GetPosition());
+	return Vector2f();
 }
 
 /**
@@ -100,7 +56,7 @@ Body::getPosition() const {
  */
 Vector2f
 Body::getSpeed() const {
-	return vector(mBody->GetLinearVelocity());
+	return Vector2f();
 }
 
 /**
@@ -108,7 +64,7 @@ Body::getSpeed() const {
  */
 float
 Body::getAngle() const {
-	return thor::toDegree(mBody->GetAngle());
+	return 0;
 }
 
 /**
@@ -124,7 +80,7 @@ Body::getDelete() const {
  */
 Body::Category
 Body::getCategory() const {
-	return (Category) mBody->GetFixtureList()->GetFilterData().categoryBits;
+	return CATEGORY_WORLD;
 }
 
 /**
@@ -132,8 +88,7 @@ Body::getCategory() const {
  */
 Vector2f
 Body::getSize() const {
-	b2AABB aabb(mBody->GetFixtureList()->GetAABB(0));
-	return vector(aabb.upperBound - aabb.lowerBound);
+	return Vector2f();
 }
 
 /**
@@ -141,7 +96,7 @@ Body::getSize() const {
  */
 bool
 Body::isSolid() const {
-	return mBody->GetFixtureList()->GetFilterData().maskBits != 0;
+	return false;
 }
 
 /**
@@ -149,7 +104,7 @@ Body::isSolid() const {
  */
 bool
 Body::isMovable() const {
-	return mBody->GetType() != b2_staticBody;
+	return false;
 }
 
 /**
@@ -172,7 +127,7 @@ Body::doesCollide(Body& other) {
  * @param category The Category of the other object (as passed in constructor).
  */
 void
-Body::onCollide(Body& other, uint16 type) {
+Body::onCollide(Body& other, Category type) {
 }
 
 /**
@@ -191,11 +146,6 @@ Body::setDelete(bool value) {
  */
 void
 Body::setSpeed(Vector2f direction, float speed) {
-	if (direction != Vector2f()) {
-		direction = thor::unitVector<float>(direction);
-	}
-	direction *= speed;
-	mBody->SetLinearVelocity(vector(direction));
 }
 
 /**
@@ -203,5 +153,4 @@ Body::setSpeed(Vector2f direction, float speed) {
  */
 void
 Body::setAngle(float angle) {
-	mBody->SetTransform(mBody->GetPosition(), thor::toRadian(angle));
 }
diff --git a/source/abstract/Body.h b/source/abstract/Body.h
index 3994a25..73c1577 100755
--- a/source/abstract/Body.h
+++ b/source/abstract/Body.h
@@ -8,12 +8,12 @@
 #ifndef DG_BODY_H_
 #define DG_BODY_H_
 
-#include <Box2D/Box2D.h>
-
+#include "../World.h"
 #include "../types/String.h"
 #include "../types/Vector.h"
 #include "../util/Yaml.h"
 
+class World;
 class Yaml;
 
 /**
@@ -24,31 +24,6 @@ class Yaml;
 class Body {
 // Public types.
 public:
-	/**
-	 * POD container that carries all data required to construct this class.
-	 */
-	class PhysicalData {
-	public:
-		PhysicalData() = default;
-		PhysicalData(const Vector2f& position, b2World& world, uint16 category,
-				uint16 maskExclude, bool moving, bool bullet = false, bool circle = false);
-		/// World position of the body in pixel coordinates.
-		const Vector2f& position;
-		/// Box2D world object.
-		b2World& world;
-		/// The category for collision filtering. Only one may be set. @link Physical::Category
-		uint16 category;
-		/// All categories set here will have collisions disabled with this object.
-		uint16 maskExclude;
-		/// True if the body may move on its own (player, monster).
-		bool moving;
-		/// True if the object is a bullet.
-		bool bullet;
-		/// True if the body collides as a circle. Radius is side length / 2,
-		/// both sides must be equal.
-		bool circle;
-	};
-
 	/**
 	 * Categories of physical objects, for Box2D collision filtering.
 	 * The order of categories is also used for render order in Collection::draw()
@@ -63,6 +38,31 @@ public:
 		CATEGORY_ACTOR = 1 << 4
 	};
 
+	/**
+	 * POD container that carries all data required to construct this class.
+	 */
+	class PhysicalData {
+	public:
+		PhysicalData() = default;
+		PhysicalData(const Vector2f& position, World& world, Category category,
+				unsigned short maskExclude, bool moving, bool bullet = false, bool circle = false);
+		/// World position of the body in pixel coordinates.
+		const Vector2f& position;
+		/// Box2D world object.
+		World& world;
+		/// The category for collision filtering. Only one may be set. @link Physical::Category
+		Category category;
+		/// All categories set here will have collisions disabled with this object.
+		unsigned short maskExclude;
+		/// True if the body may move on its own (player, monster).
+		bool moving;
+		/// True if the object is a bullet.
+		bool bullet;
+		/// True if the body collides as a circle. Radius is side length / 2,
+		/// both sides must be equal.
+		bool circle;
+	};
+
 	/**
 	 * Common collision masking values.
 	 */
@@ -87,7 +87,7 @@ public:
 	bool isMovable() const;
 
 	virtual bool doesCollide(Body& other);
-	virtual void onCollide(Body& other, uint16 category);
+	virtual void onCollide(Body& other, Category category);
 
 // Public variables.
 public:
@@ -103,7 +103,6 @@ protected:
 
 // Private variables.
 private:
-	b2Body* mBody;
 	bool mDelete;
 };
 
diff --git a/source/abstract/Sprite.cpp b/source/abstract/Sprite.cpp
index 6913d4c..d21de7d 100644
--- a/source/abstract/Sprite.cpp
+++ b/source/abstract/Sprite.cpp
@@ -31,7 +31,7 @@ Sprite::Sprite(const Yaml& config, const PhysicalData& data, const Vector2i& siz
 }
 
 /**
- * Does nothing.
+ * Used to make this class pure virtual without any pure virtual function.
  */
 Sprite::~Sprite() {
 }
diff --git a/source/effects/Bullet.cpp b/source/effects/Bullet.cpp
index 71a21dc..6c1a87f 100755
--- a/source/effects/Bullet.cpp
+++ b/source/effects/Bullet.cpp
@@ -6,6 +6,8 @@
  */
 
 #include "Bullet.h"
+
+#include <Thor/Vectors.hpp>
 
 #include "../abstract/Character.h"
 #include "../util/Loader.h"
@@ -23,14 +25,16 @@ const float Bullet::DEFAULT_SPEED = 500;
  * @param world Box2d world.
  * @param texture Texture to display for bullet.
  */
-Bullet::Bullet(const Vector2f& position, b2World& world, Body& shooter, float direction,
+Bullet::Bullet(const Vector2f& position, World& world, Body& shooter, float direction,
 	const Yaml& config) :
 		Particle(config, PhysicalData(position, world, CATEGORY_PARTICLE, CATEGORY_PARTICLE,
 				true, true, true)),
 		mShooter(shooter),
 		mDamage(config.get(KEY_DAMAGE, DEFAULT_DAMAGE)),
-		mSpeed(config.get(KEY_SPEED, DEFAULT_SPEED)) {
-	setSpeed(angle(direction), mSpeed);
+		mSpeed(config.get(KEY_SPEED, DEFAULT_SPEED)) {
+	Vector2f dir(1.0f, 0);
+	thor::setPolarAngle(dir, direction);
+	setSpeed(dir, mSpeed);
 	setAngle(direction);
 }
 
@@ -38,7 +42,7 @@ Bullet::Bullet(const Vector2f& position, b2World& world, Body& shooter, float di
  * @copydoc Physical::onCollide
  */
 void
-Bullet::onCollide(Body& other, uint16 type) {
+Bullet::onCollide(Body& other, Category type) {
 	// Make sure we do not damage twice.
 	if (!getDelete()) {
 		// Call onShot on other, with damage as param.
diff --git a/source/effects/Bullet.h b/source/effects/Bullet.h
index 73a3222..cd2481b 100755
--- a/source/effects/Bullet.h
+++ b/source/effects/Bullet.h
@@ -21,10 +21,10 @@ class Yaml;
 class Bullet : public Particle {
 // Public functions.
 public:
-	Bullet(const Vector2f& position, b2World& world, Body& shooter, float direction,
+	Bullet(const Vector2f& position, World& world, Body& shooter, float direction,
 			const Yaml& config);
 
-	void onCollide(Body& other, uint16 category);
+	void onCollide(Body& other, Category category);
 	bool doesCollide(Body& other);
 
 // Private variables.
diff --git a/source/items/Weapon.cpp b/source/items/Weapon.cpp
index 338c400..66a3d1b 100755
--- a/source/items/Weapon.cpp
+++ b/source/items/Weapon.cpp
@@ -25,10 +25,11 @@ Weapon::Weapon(const Instances& instances, Body& holder, const Yaml& config) :
 		mWorld(instances.world),
 		mBullet(config.get(KEY_BULLET, DEFAULT_BULLET)),
 		mTimer(sf::milliseconds(config.get(KEY_INTERVAL, DEFAULT_INTERVAL))) {
+	Vector2f holderSize = mHolder.getSize();
 	Yaml bullet(mBullet);
-	Vector2i bulletSize = bullet.get(Body::KEY_SIZE, Body::DEFAULT_SIZE);
-	mOffset = Vector2f(0, std::max(mHolder.getSize().x, mHolder.getSize().y) / 2 +
-			b2_linearSlop +
+	Vector2i bulletSize = bullet.get(Body::KEY_SIZE, Vector2i());
+	mOffset = Vector2f(0,
+			std::max(holderSize.x, holderSize.y) / 2 +
 			std::max(bulletSize.x, bulletSize.y) / 2);
 }
 
diff --git a/source/items/Weapon.h b/source/items/Weapon.h
index 82832e9..47de0c5 100755
--- a/source/items/Weapon.h
+++ b/source/items/Weapon.h
@@ -46,7 +46,7 @@ private:
 	static const int DEFAULT_INTERVAL;
 
 	Body& mHolder;
-	b2World& mWorld;
+	World& mWorld;
 
 	Vector2f mOffset; //< Offset to the point where bullets are inserted (from holder center).
 	const String mBullet;
diff --git a/source/sprites/Corpse.cpp b/source/sprites/Corpse.cpp
index 17d8cd1..6ca8bed 100644
--- a/source/sprites/Corpse.cpp
+++ b/source/sprites/Corpse.cpp
@@ -7,7 +7,7 @@
 
 #include "Corpse.h"
 
-Corpse::Corpse(b2World& world, const Vector2f& position, const Yaml& config) :
+Corpse::Corpse(World& world, const Vector2f& position, const Yaml& config) :
 		Sprite(config, PhysicalData(position, world, CATEGORY_NONSOLID, MASK_NONE, false)) {
 }
 
diff --git a/source/sprites/Corpse.h b/source/sprites/Corpse.h
index 0520c80..6e7bc80 100644
--- a/source/sprites/Corpse.h
+++ b/source/sprites/Corpse.h
@@ -17,7 +17,7 @@ class Yaml;
 class Corpse : public Sprite {
 // Public functions.
 public:
-	Corpse(b2World& world, const Vector2f& position, const Yaml& config);
+	Corpse(World& world, const Vector2f& position, const Yaml& config);
 };
 
 #endif /* DG_CORPSE_H_ */
diff --git a/source/sprites/Enemy.h b/source/sprites/Enemy.h
index 7515acc..3836f77 100644
--- a/source/sprites/Enemy.h
+++ b/source/sprites/Enemy.h
@@ -30,7 +30,7 @@ private:
 
 // Private variablese.
 private:
-	b2World& mWorld;
+	World& mWorld;
 	Collection& mCollection;
 };
 
diff --git a/source/sprites/Player.cpp b/source/sprites/Player.cpp
index 34f4c32..d6b0dae 100644
--- a/source/sprites/Player.cpp
+++ b/source/sprites/Player.cpp
@@ -61,22 +61,22 @@ Player::move(const Vector2f& destination) {
 void
 Player::setDirection(Direction direction, bool unset) {
 	if (unset) {
-		mDirection = mDirection & ~(uint8) direction;
+		mDirection = mDirection & ~direction;
 	} else {
-		mDirection = mDirection | (uint8) direction;
+		mDirection = mDirection | direction;
 	}
 	// Convert directions into a vector.
 	Vector2f dirVec(0, 0);
-	if (mDirection & (uint8) Direction::RIGHT) {
+	if (mDirection & Direction::RIGHT) {
 		dirVec.x += 1.0f;
 	}
-	if (mDirection & (uint8) Direction::LEFT) {
+	if (mDirection & Direction::LEFT) {
 		dirVec.x += - 1.0f;
 	}
-	if (mDirection & (uint8) Direction::DOWN) {
+	if (mDirection & Direction::DOWN) {
 		dirVec.y += 1.0f;
 	}
-	if (mDirection & (uint8) Direction::UP) {
+	if (mDirection & Direction::UP) {
 		dirVec.y += - 1.0f;
 	}
 	setSpeed(dirVec, getMovementSpeed());
@@ -92,14 +92,14 @@ Player::onThink(float elapsedTime) {
 		Character::move();
 	}
 	// Look towards crosshair.
-	setAngle(angle(mCrosshairPosition));
+	setAngle(thor::polarAngle(mCrosshairPosition));
 }
 
 /**
  * Stop movement if we collide with anything except bullets.
  */
 void
-Player::onCollide(Body& other, uint16 category) {
+Player::onCollide(Body& other, Category category) {
 	if (category != CATEGORY_PARTICLE) {
 		setDestination(getPosition());
 	}
diff --git a/source/sprites/Player.h b/source/sprites/Player.h
index 99cc935..fa3a9fe 100644
--- a/source/sprites/Player.h
+++ b/source/sprites/Player.h
@@ -33,7 +33,7 @@ public:
 	/**
 	 * Movement directions that can be set via Player::setDirection().
 	 */
-	enum class Direction : uint8 {
+	enum Direction : unsigned char {
 		RIGHT = 1 << 0,
 		LEFT = 1 << 1,
 		UP = 1 << 2,
@@ -51,13 +51,13 @@ public:
 
 // Private functions.
 private:
-	void onCollide(Body& other, uint16 category);
+	void onCollide(Body& other, Category category);
 	void onThink(float elapsedTime);
 
 // Private variables.
 private:
 	Vector2f mCrosshairPosition; //< Relative position of the point to fire at (mouse cursor).
-	uint8 mDirection; //< Current movement direction for direct control.
+	unsigned char mDirection; //< Current movement direction for direct control.
 };
 
 #endif /* DG_PLAYER_H_ */
diff --git a/source/sprites/TileManager.cpp b/source/sprites/TileManager.cpp
index cc8244f..9854fd3 100644
--- a/source/sprites/TileManager.cpp
+++ b/source/sprites/TileManager.cpp
@@ -21,7 +21,7 @@ const Vector2i TileManager::TILE_SIZE = Vector2i(100, 100);
  *
  * @param world Box2D world to create (physical) tiles in.
  */
-TileManager::TileManager(b2World& world) :
+TileManager::TileManager(World& world) :
 		mWorld(world) {
 }
 
@@ -32,7 +32,7 @@ TileManager::TileManager(b2World& world) :
  * @param pPosition Position of the tile in tile coordinates.
  * @param world Box2D world object.
  */
-TileManager::Tile::Tile(Type type, const TilePosition& position, b2World& world) :
+TileManager::Tile::Tile(Type type, const TilePosition& position, World& world) :
 		Sprite(Yaml(getConfig(type)), PhysicalData(Vector2f(position.x * TILE_SIZE.x, position.y * TILE_SIZE.y),
 				world, CATEGORY_WORLD, (type == Type::FLOOR) ? MASK_NONE : MASK_ALL, false)),
 		mType(type) {
diff --git a/source/sprites/TileManager.h b/source/sprites/TileManager.h
index 433d2b2..659e4dc 100644
--- a/source/sprites/TileManager.h
+++ b/source/sprites/TileManager.h
@@ -9,15 +9,14 @@
 #define DG_TILEMANAGER_H_
 
 #include <map>
-#include <memory>
 #include <vector>
 
-#include <Box2D/Box2D.h>
-
+#include "../World.h"
 #include "../abstract/Sprite.h"
 #include "../types/Vector.h"
 #include "../types/String.h"
 
+class World;
 class Sprite;
 
 class TileManager : public sf::Drawable {
@@ -40,7 +39,7 @@ public:
 
 // Public functions.
 public:
-	TileManager(b2World& world);
+	TileManager(World& world);
 
 	void setTile(const TilePosition& position, Type type);
 
@@ -54,7 +53,7 @@ private:
 
 // Private variables.
 private:
-	b2World& mWorld;
+	World& mWorld;
 	std::vector<std::unique_ptr<Tile> > mTiles;
 };
 
@@ -64,7 +63,7 @@ private:
 class TileManager::Tile : public Sprite {
 // Public functions.
 public:
-	Tile(Type type, const TilePosition& position, b2World& world);
+	Tile(Type type, const TilePosition& position, World& world);
 
 	Type getType() const;
 	TilePosition getTilePosition() const;
diff --git a/source/types/Instances.h b/source/types/Instances.h
index 2819bca..8a4bbef 100644
--- a/source/types/Instances.h
+++ b/source/types/Instances.h
@@ -8,12 +8,12 @@
 #ifndef DG_INSTANCES_H_
 #define DG_INSTANCES_H_
 
-#include <Box2D/Box2D.h>
-
+#include "../World.h"
 #include "../sprites/TileManager.h"
 #include "../util/Collection.h"
 #include "../util/Pathfinder.h"
 
+class World;
 class Pathfinder;
 class TileManager;
 class Collection;
@@ -23,13 +23,13 @@ class Collection;
  */
 struct Instances {
 	Instances() = default;
-	Instances(Pathfinder& p, TileManager& t, Collection& c, b2World& w) :
+	Instances(Pathfinder& p, TileManager& t, Collection& c, World& w) :
 			pathfinder(p), tilemanager(t), collection(c), world(w) {};
 
 	Pathfinder& pathfinder;
 	TileManager& tilemanager;
 	Collection& collection;
-	b2World& world;
+	World& world;
 };
 
 #endif /* DG_INSTANCES_H_ */
diff --git a/source/types/Vector.h b/source/types/Vector.h
index ba0f026..a054abe 100644
--- a/source/types/Vector.h
+++ b/source/types/Vector.h
@@ -12,8 +12,6 @@
 
 #include <SFML/System.hpp>
 
-#include <Box2D/Box2D.h>
-
 #include <Thor/Vectors.hpp>
 
 /**
@@ -26,58 +24,4 @@ typedef sf::Vector2f Vector2f;
  */
 typedef sf::Vector2i Vector2i;
 
-/**
- * Constant for conversion between Box2D vectors and SFML vectors.
- */
-static const int PIXELS_PER_METER = 25;
-
-/**
- * Converts a distance from pixels to meters.
- */
-inline float
-pixelToMeter(float in) {
-	return in / PIXELS_PER_METER;
-}
-
-/**
- * Converts a distance from meters to pixels.
- */
-inline float
-meterToPixel(float in) {
-	return in * PIXELS_PER_METER;
-}
-
-/**
- * Converts Box2D metric vector to SFML pixel vector.
- */
-inline Vector2f
-vector(const b2Vec2& in) {
-	return Vector2f(meterToPixel(in.x), meterToPixel(in.y));
-}
-
-/**
- * Converts SFML pixel vector to Box2D metric vector.
- */
-inline b2Vec2
-vector(const Vector2f& in) {
-	return b2Vec2(pixelToMeter(in.x), pixelToMeter(in.y));
-}
-
-/**
- * Converts a vector to an SFML angle with the same direction.
- */
-inline float
-angle(Vector2f in) {
-	return 180 - thor::toDegree(atan2(in.x, in.y));
-}
-
-/**
- * Converts an SFML angle to a unit vector with the same direction.
- */
-inline Vector2f
-angle(float in) {
-	in = thor::toRadian(180 - in);
-	return Vector2f(sin(in), cos(in));
-}
-
 #endif /* DG_VECTOR_H_ */
diff --git a/source/util/Pathfinder.h b/source/util/Pathfinder.h
index 4545f21..01b043d 100644
--- a/source/util/Pathfinder.h
+++ b/source/util/Pathfinder.h
@@ -8,8 +8,6 @@
 #ifndef PATHFINDER_H_
 #define PATHFINDER_H_
 
-#include <Box2D/Box2D.h>
-
 #include "../abstract/Body.h"
 #include "../types/Vector.h"
 
diff --git a/source/util/Timer.cpp b/source/util/Timer.cpp
index 096235e..ae8cc7b 100644
--- a/source/util/Timer.cpp
+++ b/source/util/Timer.cpp
@@ -10,7 +10,7 @@
 #include <assert.h>
 
 /**
- * INitializes time limit to zero.
+ * Initializes time limit to zero.
  */
 Timer::Timer() {
 }