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diff --git a/src/blu_cat/int/core.hpp b/src/blu_cat/int/core.hpp
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+/*
+ * Copyright 2022-2024 Frederico de Oliveira Linhares
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef BLU_CAT_INT_CORE_H
+#define BLU_CAT_INT_CORE_H 1
+
+#define BLU_CAT_VERSION_MAJOR 0
+#define BLU_CAT_VERSION_MINOR 1
+#define BLU_CAT_VERSION_PATCH 0
+
+#include <chrono>
+#include <cstdint>
+#include <memory>
+#include <random>
+
+#include "../com/command.hpp"
+#include "../com/job_queue.hpp"
+#include "../com/worker.hpp"
+#include "../gra/device.hpp"
+#include "../gra/descriptor_set_layout.hpp"
+#include "../gra/framebuffer.hpp"
+#include "../gra/graphics_pipeline_2d_solid_layout.hpp"
+#include "../gra/graphics_pipeline_2d_wired_layout.hpp"
+#include "../gra/graphics_pipeline_2d_solid.hpp"
+#include "../gra/graphics_pipeline_2d_wired.hpp"
+#include "../gra/graphics_pipeline_3d_layout.hpp"
+#include "../gra/graphics_pipeline_3d.hpp"
+#include "../gra/graphics_pipeline_3d_skeletal.hpp"
+#include "../gra/graphics_pipeline_sprite_3d.hpp"
+#include "../gra/light.hpp"
+#include "../gra/log.hpp"
+#include "../gra/render_pass.hpp"
+#include "../gra/renderer.hpp"
+#include "../gra/swapchain.hpp"
+#include "../gra/vulkan.hpp"
+
+namespace BluCat::INT
+{
+
+extern std::random_device random_seed;
+extern std::mt19937 random_number_generator;
+
+struct Core
+{
+  static const CommandChain loader;
+
+  Log::Logger log;
+
+  COM::JobQueue job_queue;
+  std::vector<COM::Worker> workers;
+  std::vector<std::thread> threads;
+
+  /// Text displayed in the game window.
+  std::string game_name;
+
+  /**
+   * @{
+   * This is the ammount of pixel that the games uses when rendering to the
+   * screen.
+   */
+  uint32_t display_width, display_height;
+  /// @}
+
+  int game_version_major, game_version_minor, game_version_patch;
+
+  uint32_t fps;
+  std::chrono::duration<long long, std::milli> max_frame_duration;
+  float delta_time;
+
+  FT_Library font_library;
+
+  VkSurfaceKHR window_surface;
+  VkInstance vk_instance;
+
+#ifdef DEBUG
+  VkDebugUtilsMessengerEXT vk_callback;
+#endif
+
+  // Vulkan devices.
+  std::vector<BluCat::GRA::Device> vk_devices;
+  BluCat::GRA::Device *vk_device_with_swapchain;
+  BluCat::GRA::Swapchain *vk_swapchain;
+
+  BluCat::GRA::Framebuffer *vk_framebuffer;
+  BluCat::GRA::RenderPass *vk_render_pass;
+  BluCat::GRA::DescriptorSetLayout *vk_descriptor_set_layout;
+  BluCat::GRA::GraphicsPipeline3DLayout *vk_graphics_pipeline_3d_layout;
+  BluCat::GRA::GraphicsPipeline2DSolidLayout
+	*vk_graphics_pipeline_2d_solid_layout;
+  BluCat::GRA::GraphicsPipeline2DWiredLayout
+	*vk_graphics_pipeline_2d_wired_layout;
+  BluCat::GRA::Light *vk_light;
+  std::unique_ptr<BluCat::GRA::GraphicsPipeline3D> vk_graphics_pipeline_3d;
+  std::unique_ptr<BluCat::GRA::GraphicsPipeline3DSkeletal>
+  vk_graphics_pipeline_3d_skeletal;
+  std::unique_ptr<BluCat::GRA::GraphicsPipelineSprite3D>
+	vk_graphics_pipeline_sprite_3d;
+  std::unique_ptr<BluCat::GRA::GraphicsPipeline2DSolid>
+	vk_graphics_pipeline_2d_solid;
+  std::unique_ptr<BluCat::GRA::GraphicsPipeline2DWired>
+	vk_graphics_pipeline_2d_wired;
+
+  BluCat::GRA::Renderer *vk_renderer;
+};
+
+extern Core core;
+
+}
+
+#endif /* BLU_CAT_INT_CORE_H */