diff --git a/src/application.cpp b/src/application.cpp
index ffa567f..5e2d55a 100644
--- a/src/application.cpp
+++ b/src/application.cpp
@@ -59,7 +59,7 @@ application::application():
 	sdl_gl_context(nullptr)
 {
 	// Setup logging
-	logger = new ::logger();
+	logger = new debug::logger();
 	
 	// Get SDL compiled version
 	SDL_version sdl_compiled_version;
@@ -222,7 +222,7 @@ application::application():
 	frame_scheduler->set_max_frame_duration(0.25);
 
 	// Setup performance sampling
-	performance_sampler = new ::performance_sampler();
+	performance_sampler = new debug::performance_sampler();
 	performance_sampler->set_sample_size(15);
 }
 
diff --git a/src/application.hpp b/src/application.hpp
index 8bc08bb..cff6175 100644
--- a/src/application.hpp
+++ b/src/application.hpp
@@ -33,12 +33,16 @@ class event_dispatcher;
 class frame_scheduler;
 class game_controller;
 class keyboard;
-class logger;
 class mouse;
-class performance_sampler;
 class rasterizer;
 class image;
 
+namespace debug
+{
+	class logger;
+	class performance_sampler;
+}
+
 /**
  * 
  */
@@ -179,7 +183,7 @@ public:
 	::rasterizer* get_rasterizer();
 	
 	/// Returns the application logger.
-	::logger* get_logger();
+	debug::logger* get_logger();
 	
 	/// Returns the virtual keyboard.
 	::keyboard* get_keyboard();
@@ -213,7 +217,7 @@ private:
 	std::array<int, 2> viewport_dimensions;
 	std::array<int, 2> mouse_position;
 	double update_rate;
-	logger* logger;
+	debug::logger* logger;
 
 	SDL_Window* sdl_window;
 	SDL_GLContext sdl_gl_context;
@@ -222,7 +226,7 @@ private:
 	
 	// Frame timing
 	frame_scheduler* frame_scheduler;
-	performance_sampler* performance_sampler;
+	debug::performance_sampler* performance_sampler;
 	
 	// Events
 	event_dispatcher* event_dispatcher;
@@ -234,7 +238,7 @@ private:
 	std::unordered_map<int, game_controller*> game_controller_map;
 };
 
-inline logger* application::get_logger()
+inline debug::logger* application::get_logger()
 {
 	return logger;
 }
diff --git a/src/debug/ansi-codes.hpp b/src/debug/ansi-codes.hpp
index a2295f5..ec0e004 100644
--- a/src/debug/ansi-codes.hpp
+++ b/src/debug/ansi-codes.hpp
@@ -17,9 +17,12 @@
  * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ANTKEEPER_ANSI_CODES_HPP
-#define ANTKEEPER_ANSI_CODES_HPP
+#ifndef ANTKEEPER_DEBUG_ANSI_CODES_HPP
+#define ANTKEEPER_DEBUG_ANSI_CODES_HPP
 
+namespace debug {
+
+/// ANSI escape codes.
 namespace ansi {
 
 constexpr char* reset = "\u004b[0m";
@@ -65,6 +68,7 @@ constexpr char* underline = "\u003b[4m";
 constexpr char* reversed = "\u001b[7m";
 
 } // namespace ansi
+} // namespace debug
 
-#endif // ANTKEEPER_ANSI_CODES_HPP
+#endif // ANTKEEPER_DEBUG_ANSI_CODES_HPP
 
diff --git a/src/debug/cli.cpp b/src/debug/cli.cpp
index f2cf52f..8f12025 100644
--- a/src/debug/cli.cpp
+++ b/src/debug/cli.cpp
@@ -19,6 +19,8 @@
 
 #include "cli.hpp"
 
+namespace debug {
+
 std::string cli::interpret(const std::string& line) const
 {
 	std::istringstream stream(line);
@@ -38,3 +40,5 @@ void cli::unregister_command(const std::string& name)
 	if (auto it = commands.find(name); it != commands.end())
 		commands.erase(it);
 }
+
+} // namespace debug
diff --git a/src/debug/cli.hpp b/src/debug/cli.hpp
index d326c31..4f7f6f6 100644
--- a/src/debug/cli.hpp
+++ b/src/debug/cli.hpp
@@ -17,8 +17,8 @@
  * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ANTKEEPER_CLI_HPP
-#define ANTKEEPER_CLI_HPP
+#ifndef ANTKEEPER_DEBUG_CLI_HPP
+#define ANTKEEPER_DEBUG_CLI_HPP
 
 #include <functional>
 #include <map>
@@ -26,6 +26,8 @@
 #include <string>
 #include <tuple>
 
+namespace debug {
+
 /**
  * Minimal command-line interpreter.
  */
@@ -129,4 +131,6 @@ typename cli::command_type cli::wrap(const std::function<T(Args...)>& function)
 		std::placeholders::_1);
 }
 
-#endif // ANTKEEPER_CLI_HPP
+} // namespace debug
+
+#endif // ANTKEEPER_DEBUG_CLI_HPP
diff --git a/src/debug/debug.hpp b/src/debug/debug.hpp
new file mode 100644
index 0000000..6850d97
--- /dev/null
+++ b/src/debug/debug.hpp
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2021  Christopher J. Howard
+ *
+ * This file is part of Antkeeper source code.
+ *
+ * Antkeeper source code is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Antkeeper source code is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef ANTKEEPER_DEBUG_HPP
+#define ANTKEEPER_DEBUG_HPP
+
+/// Debugging functions and classes
+namespace debug {}
+
+#include "ansi-codes.hpp"
+#include "cli.hpp"
+#include "logger.hpp"
+#include "performance-sampler.hpp"
+
+#endif // ANTKEEPER_DEBUG_HPP
diff --git a/src/debug/logger.cpp b/src/debug/logger.cpp
index 0213f62..602a7c3 100644
--- a/src/debug/logger.cpp
+++ b/src/debug/logger.cpp
@@ -21,6 +21,8 @@
 #include "utility/timestamp.hpp"
 #include <iostream>
 
+namespace debug {
+
 logger::logger():
 	os(&std::cout),
 	auto_newline(true),
@@ -188,3 +190,5 @@ void logger::pop_task(int status)
 		error(message);
 	}
 }
+
+} // namespace debug
diff --git a/src/debug/logger.hpp b/src/debug/logger.hpp
index 26a5ce3..3aed487 100644
--- a/src/debug/logger.hpp
+++ b/src/debug/logger.hpp
@@ -17,14 +17,16 @@
  * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ANTKEEPER_LOGGER_HPP
-#define ANTKEEPER_LOGGER_HPP
+#ifndef ANTKEEPER_DEBUG_LOGGER_HPP
+#define ANTKEEPER_DEBUG_LOGGER_HPP
 
 #include <list>
 #include <ostream>
 #include <stack>
 #include <string>
 
+namespace debug {
+
 /**
  * Logs formatted debug messages to an output stream.
  */
@@ -120,5 +122,7 @@ inline const std::string& logger::get_history() const
 	return history;
 }
 
-#endif // ANTKEEPER_LOGGER_HPP
+} // namespace debug
+
+#endif // ANTKEEPER_DEBUG_LOGGER_HPP
 
diff --git a/src/debug/performance-sampler.cpp b/src/debug/performance-sampler.cpp
index bba246b..9732028 100644
--- a/src/debug/performance-sampler.cpp
+++ b/src/debug/performance-sampler.cpp
@@ -21,6 +21,8 @@
 #include <algorithm>
 #include <numeric>
 
+namespace debug {
+
 performance_sampler::performance_sampler():
 	sample_size(1),
 	sample_index(0)
@@ -60,3 +62,5 @@ double performance_sampler::mean_frame_duration() const
 	return std::accumulate(samples.begin(), samples.end(), 0.0) / static_cast<double>(samples.size());
 }
 
+} // namespace debug
+
diff --git a/src/debug/performance-sampler.hpp b/src/debug/performance-sampler.hpp
index f4eed06..8d50708 100644
--- a/src/debug/performance-sampler.hpp
+++ b/src/debug/performance-sampler.hpp
@@ -17,12 +17,14 @@
  * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
  */
 
-#ifndef ANTKEEPER_PERFORMANCE_SAMPLER_HPP
-#define ANTKEEPER_PERFORMANCE_SAMPLER_HPP
+#ifndef ANTKEEPER_DEBUG_PERFORMANCE_SAMPLER_HPP
+#define ANTKEEPER_DEBUG_PERFORMANCE_SAMPLER_HPP
 
 #include <cstdlib>
 #include <vector>
 
+namespace debug {
+
 /**
  * Measures a rolling mean frame duration.
  */
@@ -62,5 +64,6 @@ private:
 	std::size_t sample_index;
 };
 
-#endif // ANTKEEPER_PERFORMANCE_SAMPLER_HPP
+} // namespace debug
 
+#endif // ANTKEEPER_DEBUG_PERFORMANCE_SAMPLER_HPP
diff --git a/src/game/bootloader.cpp b/src/game/bootloader.cpp
index 847399a..715481d 100644
--- a/src/game/bootloader.cpp
+++ b/src/game/bootloader.cpp
@@ -120,7 +120,7 @@ static void setup_callbacks(game_context* ctx);
 int bootloader(application* app, int argc, char** argv)
 {
 	// Get application logger
-	logger* logger = app->get_logger();
+	debug::logger* logger = app->get_logger();
 	
 	logger->push_task("Running application bootloader");
 	
@@ -166,7 +166,7 @@ int bootloader(application* app, int argc, char** argv)
 
 void parse_options(game_context* ctx, int argc, char** argv)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Parsing command line options");
 	
 	try
@@ -232,7 +232,7 @@ void parse_options(game_context* ctx, int argc, char** argv)
 
 void setup_resources(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	
 	// Setup resource manager
 	ctx->resource_manager = new resource_manager(logger);
@@ -354,7 +354,7 @@ void setup_resources(game_context* ctx)
 
 void load_config(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Loading config");
 	
 	// Load config file
@@ -370,7 +370,7 @@ void load_config(game_context* ctx)
 
 void load_strings(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Loading strings");
 		
 	ctx->string_table = ctx->resource_manager->load<string_table>("strings.csv");
@@ -394,7 +394,7 @@ void load_strings(game_context* ctx)
 
 void setup_window(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Setting up window");
 	
 	application* app = ctx->app;
@@ -441,7 +441,7 @@ void setup_window(game_context* ctx)
 
 void setup_rendering(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Setting up rendering");
 	
 	// Get rasterizer from application
@@ -613,7 +613,7 @@ void setup_rendering(game_context* ctx)
 
 void setup_scenes(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Setting up rendering");
 	
 	// Get default framebuffer
@@ -1242,7 +1242,7 @@ void setup_controls(game_context* ctx)
 
 void setup_cli(game_context* ctx)
 {
-	ctx->cli = new cli();
+	ctx->cli = new debug::cli();
 	ctx->cli->register_command("echo", cc::echo);
 	ctx->cli->register_command("exit", std::function<std::string()>(std::bind(&cc::exit, ctx)));
 	ctx->cli->register_command("scrot", std::function<std::string()>(std::bind(&cc::scrot, ctx)));
diff --git a/src/game/console-commands.cpp b/src/game/console-commands.cpp
index 5acfb16..5ce363e 100644
--- a/src/game/console-commands.cpp
+++ b/src/game/console-commands.cpp
@@ -23,8 +23,7 @@
 #include "game/game-context.hpp"
 #include "debug/cli.hpp"
 
-namespace cc
-{
+namespace cc {
 
 std::string echo(std::string text)
 {
@@ -46,9 +45,9 @@ std::string scrot(game_context* ctx)
 std::string cue(game_context* ctx, float t, std::string command)
 {
 	::timeline* timeline = ctx->timeline;
-	::cli* cli = ctx->cli;
+	debug::cli* cli = ctx->cli;
 	
-	timeline->add_cue({timeline->get_position() + t, std::function<void()>(std::bind(&::cli::interpret, cli, command))});
+	timeline->add_cue({timeline->get_position() + t, std::function<void()>(std::bind(&debug::cli::interpret, cli, command))});
 	
 	return std::string("command \"" + command + "\" will execute in " + std::to_string(t) + " seconds");
 }
diff --git a/src/game/console-commands.hpp b/src/game/console-commands.hpp
index aabb827..d31767e 100644
--- a/src/game/console-commands.hpp
+++ b/src/game/console-commands.hpp
@@ -24,8 +24,7 @@
 
 struct game_context;
 
-namespace cc
-{
+namespace cc {
 
 std::string echo(std::string text);
 
diff --git a/src/game/game-context.hpp b/src/game/game-context.hpp
index 8e7a765..ac88f55 100644
--- a/src/game/game-context.hpp
+++ b/src/game/game-context.hpp
@@ -49,7 +49,6 @@ class directional_light;
 class final_pass;
 class framebuffer;
 class locomotion_system;
-class logger;
 class material;
 class input_listener;
 class material_pass;
@@ -82,7 +81,6 @@ class renderer;
 class model_instance;
 class input_event_router;
 class input_mapper;
-class cli;
 class outline_pass;
 class tracking_system;
 class painting_system;
@@ -94,13 +92,19 @@ template <typename T> class animation;
 template <typename T> class material_property;
 template <typename T> class tween;
 
+namespace debug
+{
+	class cli;
+	class logger;
+}
+
 /**
  * 
  */
 struct game_context
 {
 	application* app;
-	logger* logger;
+	debug::logger* logger;
 	std::ofstream log_filestream;
 	
 	// Command-line options
@@ -253,7 +257,7 @@ struct game_context
 	biome* biome;
 	
 	// Debug
-	cli* cli;
+	debug::cli* cli;
 	
 	// Misc
 	pheromone_matrix* pheromones;
diff --git a/src/game/states/loading-state.cpp b/src/game/states/loading-state.cpp
index 1953728..c26aff1 100644
--- a/src/game/states/loading-state.cpp
+++ b/src/game/states/loading-state.cpp
@@ -24,7 +24,7 @@
 
 void loading_state_enter(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Entering loading state");
 
 	logger->pop_task(EXIT_SUCCESS);
@@ -34,7 +34,7 @@ void loading_state_enter(game_context* ctx)
 
 void loading_state_exit(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Exiting loading state");
 
 	logger->pop_task(EXIT_SUCCESS);
diff --git a/src/game/states/map-state.cpp b/src/game/states/map-state.cpp
index acc7f9b..c3e690d 100644
--- a/src/game/states/map-state.cpp
+++ b/src/game/states/map-state.cpp
@@ -34,7 +34,7 @@
 
 void map_state_enter(game_context* ctx)
 {
-	logger* logger = ctx->logger;	
+	debug::logger* logger = ctx->logger;	
 	logger->push_task("Entering map state");
 	
 	// Disable sky pass
@@ -48,7 +48,7 @@ void map_state_enter(game_context* ctx)
 
 void map_state_exit(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Exiting map state");
 	
 	logger->pop_task(EXIT_SUCCESS);
diff --git a/src/game/states/play-state.cpp b/src/game/states/play-state.cpp
index a91f8e7..457692e 100644
--- a/src/game/states/play-state.cpp
+++ b/src/game/states/play-state.cpp
@@ -71,7 +71,7 @@
 
 void play_state_enter(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Entering play state");
 	
 	// Load biome
@@ -462,7 +462,7 @@ void play_state_enter(game_context* ctx)
 
 void play_state_exit(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Exiting play state");
 	
 	logger->pop_task(EXIT_SUCCESS);
diff --git a/src/game/states/splash-state.cpp b/src/game/states/splash-state.cpp
index 5c923d6..80410a3 100644
--- a/src/game/states/splash-state.cpp
+++ b/src/game/states/splash-state.cpp
@@ -34,7 +34,7 @@
 
 void splash_state_enter(game_context* ctx)
 {
-	logger* logger = ctx->logger;	
+	debug::logger* logger = ctx->logger;	
 	logger->push_task("Entering splash state");
 	
 	//ctx->app->set_window_opacity(0.5f);
@@ -99,7 +99,7 @@ void splash_state_enter(game_context* ctx)
 
 void splash_state_exit(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Exiting splash state");
 	
 	// Disable splash skipper
diff --git a/src/game/states/title-state.cpp b/src/game/states/title-state.cpp
index 1c90dd1..7561df7 100644
--- a/src/game/states/title-state.cpp
+++ b/src/game/states/title-state.cpp
@@ -24,7 +24,7 @@
 
 void title_state_enter(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Entering title state");
 
 	// Get timeline
@@ -48,7 +48,7 @@ void title_state_enter(game_context* ctx)
 
 void title_state_exit(game_context* ctx)
 {
-	logger* logger = ctx->logger;
+	debug::logger* logger = ctx->logger;
 	logger->push_task("Exiting title state");
 
 	logger->pop_task(EXIT_SUCCESS);
diff --git a/src/resources/resource-manager.cpp b/src/resources/resource-manager.cpp
index a7f2a2e..ccd5db4 100644
--- a/src/resources/resource-manager.cpp
+++ b/src/resources/resource-manager.cpp
@@ -19,7 +19,7 @@
 
 #include "resources/resource-manager.hpp"
 
-resource_manager::resource_manager(::logger* logger):
+resource_manager::resource_manager(debug::logger* logger):
 	logger(logger)
 {
 	// Init PhysicsFS
diff --git a/src/resources/resource-manager.hpp b/src/resources/resource-manager.hpp
index b225afe..cbb6d36 100644
--- a/src/resources/resource-manager.hpp
+++ b/src/resources/resource-manager.hpp
@@ -40,7 +40,7 @@ public:
 	/**
 	 * Creates a resource manager.
 	 */
-	resource_manager(::logger* logger);
+	resource_manager(debug::logger* logger);
 
 	/**
 	 * Destroys a resource manager and frees all of its resources.
@@ -89,7 +89,7 @@ private:
 	std::map<std::string, resource_handle_base*> resource_cache;
 	std::list<std::string> search_paths;
 	entt::registry archetype_registry;
-	logger* logger;
+	debug::logger* logger;
 };
 
 template <typename T>