diff --git a/src/files/engine_files.cpp b/src/files/engine_files.cpp
new file mode 100644
index 00000000..f2d5a53b
--- /dev/null
+++ b/src/files/engine_files.cpp
@@ -0,0 +1,35 @@
+#include "engine_files.h"
+
+#include <filesystem>
+
+namespace filesystem = std::filesystem;
+using std::string;
+using filesystem::path;
+
+path enginefs::get_screenshot_file(string ext) {
+	path folder = SCREENSHOTS_FOLDER;
+	if (!filesystem::is_directory(folder)) {
+		filesystem::create_directory(folder);
+	}
+
+	auto t = std::time(nullptr);
+    auto tm = *std::localtime(&t);
+
+	const char* format = "%d-%m-%Y_%H-%M-%S";
+
+	std::stringstream ss;
+	ss << std::put_time(&tm, format);
+	string datetimestr = ss.str();
+
+	path filename = folder/("screenshot-"+datetimestr+"."+ext);
+	uint index = 0;
+	while (filesystem::exists(filename)) {
+		filename = folder/("screenshot-"+datetimestr+"-"+std::to_string(index)+"."+ext);
+		index++;
+	}
+	return filename;
+}
+
+path enginefs::get_worlds_folder() {
+    return "worlds";
+}
\ No newline at end of file
diff --git a/src/files/engine_files.h b/src/files/engine_files.h
new file mode 100644
index 00000000..4dd1b3b5
--- /dev/null
+++ b/src/files/engine_files.h
@@ -0,0 +1,14 @@
+#ifndef FILES_ENGINE_FILES_H_
+#define FILES_ENGINE_FILES_H_
+
+#include <string>
+#include <filesystem>
+
+#define SCREENSHOTS_FOLDER "screenshots"
+
+namespace enginefs {
+    extern std::filesystem::path get_screenshot_file(std::string ext);
+    extern std::filesystem::path get_worlds_folder();
+}
+
+#endif // FILES_ENGINE_FILES_H_
\ No newline at end of file
diff --git a/src/frontend/screens.cpp b/src/frontend/screens.cpp
new file mode 100644
index 00000000..d56b50e4
--- /dev/null
+++ b/src/frontend/screens.cpp
@@ -0,0 +1,83 @@
+#include "screens.h"
+
+#include <iostream>
+#include <memory>
+
+#include "../window/Camera.h"
+#include "../window/Events.h"
+#include "../window/input.h"
+#include "../assets/Assets.h"
+#include "../world/Level.h"
+#include "../world/World.h"
+#include "../objects/Player.h"
+#include "../voxels/ChunksController.h"
+#include "../voxels/Chunks.h"
+#include "../voxels/Chunk.h"
+#include "world_render.h"
+#include "hud.h"
+#include "gui/GUI.h"
+#include "../engine.h"
+
+using std::shared_ptr;
+
+LevelScreen::LevelScreen(Engine* engine, Level* level) : Screen(engine), level(level) {
+    worldRenderer = new WorldRenderer(level, engine->getAssets());
+    hud = new HudRenderer(engine->getGUI(), level, engine->getAssets());
+}
+
+LevelScreen::~LevelScreen() {
+    delete hud;
+    delete worldRenderer;
+
+
+    World* world = level->world;
+
+	std::cout << "-- saving world" << std::endl;
+	world->write(level, !engine->getSettings().debug.generatorTestMode);
+
+	delete world;
+    delete level;
+
+}
+
+void LevelScreen::updateHotkeys() {
+    if (Events::jpressed(keycode::O)) {
+        occlusion = !occlusion;
+    }
+    if (Events::jpressed(keycode::F3)) {
+        level->player->debug = !level->player->debug;
+    }
+    if (Events::jpressed(keycode::F5)) {
+        for (uint i = 0; i < level->chunks->volume; i++) {
+            shared_ptr<Chunk> chunk = level->chunks->chunks[i];
+            if (chunk != nullptr && chunk->isReady()) {
+                chunk->setModified(true);
+            }
+        }
+    }
+}
+
+void LevelScreen::update(float delta) {
+    gui::GUI* gui = engine->getGUI();
+    EngineSettings& settings = engine->getSettings();
+
+    bool inputLocked = hud->isPause() || hud->isInventoryOpen() || gui->isFocusCaught();
+    if (!inputLocked) {
+        updateHotkeys();
+    }
+    level->updatePlayer(delta, !inputLocked, hud->isPause(), !inputLocked);
+    level->update();
+    level->chunksController->update(settings.chunks.loadSpeed);
+}
+
+void LevelScreen::draw(float delta) {
+    EngineSettings& settings = engine->getSettings();
+    Camera* camera = level->player->camera;
+
+    float fovFactor = 18.0f / (float)settings.chunks.loadDistance;
+    worldRenderer->draw(camera, occlusion, fovFactor, settings.graphics.fogCurve);
+    hud->draw();
+    if (level->player->debug) {
+        hud->drawDebug( 1 / delta, occlusion);
+    }
+}
\ No newline at end of file
diff --git a/src/frontend/screens.h b/src/frontend/screens.h
new file mode 100644
index 00000000..f186ba39
--- /dev/null
+++ b/src/frontend/screens.h
@@ -0,0 +1,38 @@
+#ifndef FRONTEND_SCREENS_H_
+#define FRONTEND_SCREENS_H_
+
+#include "../settings.h"
+
+class Assets;
+class Level;
+class WorldRenderer;
+class HudRenderer;
+class Engine;
+
+
+/* Screen is a mainloop state */
+class Screen {
+protected:
+    Engine* engine;
+public:
+    Screen(Engine* engine) : engine(engine) {};
+    virtual ~Screen() {};
+    virtual void update(float delta) = 0;
+    virtual void draw(float delta) = 0;
+};
+
+class LevelScreen : public Screen {
+    Level* level;
+    WorldRenderer* worldRenderer;
+    HudRenderer* hud;
+    bool occlusion;
+    void updateHotkeys();
+public:
+    LevelScreen(Engine* engine, Level* level);
+    ~LevelScreen();
+
+    void update(float delta) override;
+    void draw(float delta) override;
+};
+
+#endif // FRONTEND_SCREENS_H_
\ No newline at end of file