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diff --git a/src/graphcoloring/level.hpp b/src/graphcoloring/level.hpp
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+++ b/src/graphcoloring/level.hpp
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+////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2018 Leo Tenenbaum
+// This file is part of GraphColoring.
+//
+// GraphColoring 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.
+//
+// GraphColoring 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 GraphColoring.  If not, see <https://www.gnu.org/licenses/>.
+////////////////////////////////////////////////////////////////////////////////
+
+
+#ifndef GRAPHCOLORING_LEVEL_H_
+#define GRAPHCOLORING_LEVEL_H_
+
+#include <string>
+#include <memory>
+
+#include "gui/window.hpp"
+#include "graphs/graph.hpp"
+#include "levels/globalloader.hpp"
+#include "levels/valueloader.hpp"
+#include "levels/rules/ruleloader.hpp"
+#include "levels/pointcalculator.hpp"
+
+namespace graphcoloring {
+
+class Level {
+public:
+	static pugi::xml_node GetLevelNode(
+		const pugi::xml_document& document, std::string category_id,
+		std::string level_id);
+	Level(gui::Window* window, std::string category_id, std::string level_id);
+	virtual ~Level();
+	std::pair<std::string,std::string> NextLevel() const; // Returns <"", ""> on success.
+	void Render();
+	void Save(int slot = SLOT_RECENT);
+	int Load(int slot = SLOT_RECENT); // Returns 1 on success, 0 on failure
+	static std::vector<gui::Color> colors;
+private:
+	void LoadLevelDocument();
+	std::string GetFile();
+	void Reset();
+	void MoveViewport();
+	void ResetViewport();
+	int GetPoints(bool check_if_invalid = true) const;
+	void GetBestPoints();
+	void RenderPoints(int y);
+	void RenderRules();
+	std::string SaveFilename(int slot = SLOT_RECENT) const;
+	void UpdateLevelList();
+	static constexpr int VIEW_MOVE_SPEED = 5;
+	static constexpr int TITLE_SIZE = 48;
+	static constexpr int DESCRIPTION_SIZE = 18;
+	static constexpr int OBJECTIVE_SIZE = 32;
+	static constexpr int POINTS_SIZE = 36;
+	static constexpr int PRESS_ESC_SIZE = 18;
+	static constexpr gui::Color TEXT_COLOR = 0xDDDDDDFF;
+	static constexpr gui::Color SUCCESS_COLOR = gui::colors::GREEN;
+	static constexpr gui::Color INVALID_COLOR = gui::colors::RED;
+	static constexpr int SLOT_RECENT = -2;
+	static constexpr int SLOT_BEST   = -1;
+
+	gui::Window* const window;
+	int best_points = 0;
+	bool has_loaded_best = false;
+	gui::Position viewport_position;
+	std::string category_id;
+	std::string level_id;
+	std::string title;
+	std::string description;
+	std::string objective;
+	Graph graph;
+	ColorLoader color_loader;
+	GlobalLoader global_loader;
+	ValueLoader value_loader;
+	RuleLoader rule_loader;
+	Path path;
+	PointCalculator point_calculator;
+};
+
+} // namespace graphcoloring
+
+#endif // GRAPHCOLORING_LEVEL_H_