diff --git a/Ballance/BMapInspector/BMapInspector.cpp b/Ballance/BMapInspector/BMapInspector.cpp
index 968500b..962e2fb 100644
--- a/Ballance/BMapInspector/BMapInspector.cpp
+++ b/Ballance/BMapInspector/BMapInspector.cpp
@@ -138,6 +138,11 @@ static void CheckRules(BMapInspector::Cli::Args& args, BMapInspector::Map::Level
 }
 
 int main(int argc, char* argv[]) {
+
+	// Startup CK2 engine.
+	LibCmo::CK2::CKERROR err = LibCmo::CK2::CKStartUp();
+	if (err != LibCmo::CK2::CKERROR::CKERR_OK) throw std::runtime_error("fail to initialize CK2 engine.");
+
 	auto args = AcceptArgs();
 	if (args.has_value()) {
 		PrintSplash();
@@ -148,5 +153,9 @@ int main(int argc, char* argv[]) {
 			CheckRules(args.value(), level.value());
 		}
 	}
+
+	// Shutdown CK2 engine.
+	LibCmo::CK2::CKShutdown();
+
 	return 0;
 }
diff --git a/Ballance/BMapInspector/CMakeLists.txt b/Ballance/BMapInspector/CMakeLists.txt
index 9e723e6..f88eb6f 100644
--- a/Ballance/BMapInspector/CMakeLists.txt
+++ b/Ballance/BMapInspector/CMakeLists.txt
@@ -11,6 +11,7 @@ PRIVATE
 	Map.cpp
 	Rule.cpp
 	# Rules
+	Rule/Shared.cpp
 	Rule/GpRules.cpp
 	Rule/ChirsRules.cpp
 	Rule/YYCRules.cpp
@@ -29,6 +30,7 @@ FILES
 	Map.hpp
 	Rule.hpp
 	# Rules
+	Rule/Shared.hpp
 	Rule/GpRules.hpp
 	Rule/ChirsRules.hpp
 	Rule/YYCRules.hpp
diff --git a/Ballance/BMapInspector/Map.cpp b/Ballance/BMapInspector/Map.cpp
index d1f2a2c..aa2f22f 100644
--- a/Ballance/BMapInspector/Map.cpp
+++ b/Ballance/BMapInspector/Map.cpp
@@ -92,13 +92,26 @@ namespace BMapInspector::Map {
 		}
 	}
 
-	YYCC_IMPL_MOVE_CTOR(Level, rhs) : m_Context(rhs.m_Context) {
+	YYCC_IMPL_MOVE_CTOR(Level, rhs) :
+	    m_Context(rhs.m_Context), m_ObjGroups(std::move(rhs.m_ObjGroups)), m_Obj3dObjects(std::move(rhs.m_Obj3dObjects)),
+	    m_ObjMeshes(std::move(rhs.m_ObjMeshes)), m_ObjMaterials(std::move(rhs.m_ObjMaterials)), m_ObjTextures(std::move(rhs.m_ObjTextures)),
+	    m_ObjTargetLights(std::move(rhs.m_ObjTargetLights))
+
+	{
 		rhs.m_Context = nullptr;
 	}
 
 	YYCC_IMPL_MOVE_OPER(Level, rhs) {
 		this->m_Context = rhs.m_Context;
+		this->m_ObjGroups = std::move(rhs.m_ObjGroups);
+		this->m_Obj3dObjects = std::move(rhs.m_Obj3dObjects);
+		this->m_ObjMeshes = std::move(rhs.m_ObjMeshes);
+		this->m_ObjMaterials = std::move(rhs.m_ObjMaterials);
+		this->m_ObjTextures = std::move(rhs.m_ObjTextures);
+		this->m_ObjTargetLights = std::move(rhs.m_ObjTargetLights);
+
 		rhs.m_Context = nullptr;
+
 		return *this;
 	}
 
diff --git a/Ballance/BMapInspector/Rule.cpp b/Ballance/BMapInspector/Rule.cpp
index b21b4b2..2eb7935 100644
--- a/Ballance/BMapInspector/Rule.cpp
+++ b/Ballance/BMapInspector/Rule.cpp
@@ -20,10 +20,11 @@ namespace BMapInspector::Rule {
 
 	Ruleset::Ruleset() : rules() {
 		// Add rule into list.
-		rules.emplace_back(new Gp1Rule());
-		rules.emplace_back(new Gp2Rule());
-		rules.emplace_back(new Gp3Rule());
-		rules.emplace_back(new Chirs1Rule());
+		//rules.emplace_back(new Gp1Rule());
+		//rules.emplace_back(new Gp2Rule());
+		//rules.emplace_back(new Gp3Rule());
+		//rules.emplace_back(new Chirs1Rule());
+		rules.emplace_back(new YYCRule1());
 		// Add more rules...
 	}
 
diff --git a/Ballance/BMapInspector/Rule.hpp b/Ballance/BMapInspector/Rule.hpp
index dc9ffe0..d2db082 100644
--- a/Ballance/BMapInspector/Rule.hpp
+++ b/Ballance/BMapInspector/Rule.hpp
@@ -19,7 +19,7 @@ namespace BMapInspector::Rule {
 
 	public:
 		virtual std::u8string_view GetRuleName() const = 0;
-		virtual void Check(Reporter::Reporter& reporter, Map::Level& ctx) const = 0;
+		virtual void Check(Reporter::Reporter& reporter, Map::Level& level) const = 0;
 	};
 
 	class Ruleset {
diff --git a/Ballance/BMapInspector/Rule/ChirsRules.cpp b/Ballance/BMapInspector/Rule/ChirsRules.cpp
index dc618c5..d3ca089 100644
--- a/Ballance/BMapInspector/Rule/ChirsRules.cpp
+++ b/Ballance/BMapInspector/Rule/ChirsRules.cpp
@@ -6,7 +6,7 @@ namespace BMapInspector::Rule {
 	std::u8string_view Chirs1Rule::GetRuleName() const {
 		return u8"CHIRS1";
 	}
-	void Chirs1Rule::Check(Reporter::Reporter& reporter, Map::Level& ctx) const {
+	void Chirs1Rule::Check(Reporter::Reporter& reporter, Map::Level& level) const {
 		// Report error if there is some material named Laterne_Verlauf 
 		// but its texture is not pointed to Laterne_Verlauf texture.
 
@@ -14,6 +14,5 @@ namespace BMapInspector::Rule {
 		// but its name is not Laterne_Verlauf.
 
 		// Report error if there is multiple Laterne_Verlauf material.
-		reporter.WriteError(this->GetRuleName(), u8"Fork you!");
 	}
 } // namespace BMapInspector::Rule
diff --git a/Ballance/BMapInspector/Rule/ChirsRules.hpp b/Ballance/BMapInspector/Rule/ChirsRules.hpp
index 91cfc96..009e536 100644
--- a/Ballance/BMapInspector/Rule/ChirsRules.hpp
+++ b/Ballance/BMapInspector/Rule/ChirsRules.hpp
@@ -19,6 +19,6 @@ namespace BMapInspector::Rule {
 
 	public:
 		std::u8string_view GetRuleName() const override;
-		void Check(Reporter::Reporter& reporter, Map::Level& ctx) const override;
+		void Check(Reporter::Reporter& reporter, Map::Level& level) const override;
 	};
 }
diff --git a/Ballance/BMapInspector/Rule/GpRules.cpp b/Ballance/BMapInspector/Rule/GpRules.cpp
index 9a60787..c104fd7 100644
--- a/Ballance/BMapInspector/Rule/GpRules.cpp
+++ b/Ballance/BMapInspector/Rule/GpRules.cpp
@@ -12,7 +12,7 @@ namespace BMapInspector::Rule {
 		return u8"GP1";
 	}
 
-	void Gp1Rule::Check(Reporter::Reporter& reporter, Map::Level& ctx) const {}
+	void Gp1Rule::Check(Reporter::Reporter& reporter, Map::Level& level) const {}
 
 #pragma endregion
 
@@ -26,7 +26,7 @@ namespace BMapInspector::Rule {
 		return u8"GP2";
 	}
 
-	void Gp2Rule::Check(Reporter::Reporter& reporter, Map::Level& ctx) const {}
+	void Gp2Rule::Check(Reporter::Reporter& reporter, Map::Level& level) const {}
 
 #pragma endregion
 
@@ -40,7 +40,7 @@ namespace BMapInspector::Rule {
 		return u8"GP3";
 	}
 
-	void Gp3Rule::Check(Reporter::Reporter& reporter, Map::Level& ctx) const {
+	void Gp3Rule::Check(Reporter::Reporter& reporter, Map::Level& level) const {
 		// TODO: Mesh hash is not implemented.
 	}
 
diff --git a/Ballance/BMapInspector/Rule/GpRules.hpp b/Ballance/BMapInspector/Rule/GpRules.hpp
index ac8925f..aa47d21 100644
--- a/Ballance/BMapInspector/Rule/GpRules.hpp
+++ b/Ballance/BMapInspector/Rule/GpRules.hpp
@@ -18,7 +18,7 @@ namespace BMapInspector::Rule {
 
 	public:
 		std::u8string_view GetRuleName() const override;
-		void Check(Reporter::Reporter& reporter, Map::Level& ctx) const override;
+		void Check(Reporter::Reporter& reporter, Map::Level& level) const override;
 	};
 
 	/**
@@ -35,7 +35,7 @@ namespace BMapInspector::Rule {
 
 	public:
 		std::u8string_view GetRuleName() const override;
-		void Check(Reporter::Reporter& reporter, Map::Level& ctx) const override;
+		void Check(Reporter::Reporter& reporter, Map::Level& level) const override;
 	};
 
 	/**
@@ -52,7 +52,7 @@ namespace BMapInspector::Rule {
 
 	public:
 		std::u8string_view GetRuleName() const override;
-		void Check(Reporter::Reporter& reporter, Map::Level& ctx) const override;
+		void Check(Reporter::Reporter& reporter, Map::Level& level) const override;
 	};
 
 }
diff --git a/Ballance/BMapInspector/Rule/Shared.cpp b/Ballance/BMapInspector/Rule/Shared.cpp
index e69de29..b0d8cb6 100644
--- a/Ballance/BMapInspector/Rule/Shared.cpp
+++ b/Ballance/BMapInspector/Rule/Shared.cpp
@@ -0,0 +1,67 @@
+#include "Shared.hpp"
+#include <yycc.hpp>
+#include <yycc/carton/termcolor.hpp>
+#include <filesystem>
+
+namespace termcolor = yycc::carton::termcolor;
+
+namespace BMapInspector::Rule::Shared {
+
+#pragma region Check Functions
+
+	/**
+	 * @brief 
+	 * @param[in] ctx Can not be nullptr.
+	 * @param[in] name Can not be nullptr.
+	 * @return Found pointer to CKGroup, otherwise nullptr.
+	 */
+	O::CKGroup* FetchGroup(C::CKContext* ctx, L::CKSTRING name) {
+		return static_cast<O::CKGroup*>(ctx->GetObjectByNameAndClass(name, C::CK_CLASSID::CKCID_GROUP, nullptr));
+	}
+
+	bool CheckTextureFileName(O::CKTexture* tex, L::CKSTRING name) {
+		// Get file name
+		auto filename = tex->GetUnderlyingData().GetSlotFileName(0);
+		if (filename == nullptr) return false;
+		// Extract file name part
+		std::filesystem::path filepath(filename);
+		auto filename_part = filepath.filename().u8string();
+		// Return result.
+		return C::CKStrEqualI(filename_part.c_str(), name);
+	}
+
+	std::vector<O::CK3dEntity*> Iter3dEntities(O::CKGroup* group) {
+		std::vector<O::CK3dEntity*> rv;
+		for (L::CKDWORD obj_idx = 0; obj_idx < group->GetObjectCount(); ++obj_idx) {
+			auto* group_object = group->GetObject(obj_idx);
+			if (!C::CKIsChildClassOf(group_object->GetClassID(), C::CK_CLASSID::CKCID_3DENTITY)) continue;
+			auto* group_3dentity = static_cast<O::CK3dEntity*>(group_object);
+			rv.emplace_back(group_3dentity);
+		}
+		return rv;
+	}
+
+	std::vector<O::CKMaterial*> IterMaterial(O::CKMesh* mesh) {
+		std::vector<O::CKMaterial*> rv;
+		auto* mtls = mesh->GetMaterialSlots();
+		for (L::CKDWORD mtl_idx = 0; mtl_idx < mesh->GetMaterialSlotCount(); ++mtl_idx) {
+			auto* mtl = mtls[mtl_idx];
+			if (mtl == nullptr) continue;
+			rv.emplace_back(mtl);
+		}
+		return rv;
+	}
+
+	const char8_t* RenderObjectName(O::CKObject* obj) {
+		static std::u8string ANONYMOUS = termcolor::colored(u8"<anonymous>", termcolor::Color::LightMagenta);
+		auto name = obj->GetName();
+		if (name == nullptr) {
+			return ANONYMOUS.c_str();
+		} else {
+			return name;
+		}
+	}
+
+#pragma endregion
+
+} // namespace BMapInspector::Rule::Shared
diff --git a/Ballance/BMapInspector/Rule/Shared.hpp b/Ballance/BMapInspector/Rule/Shared.hpp
index 1d5554f..a99bc76 100644
--- a/Ballance/BMapInspector/Rule/Shared.hpp
+++ b/Ballance/BMapInspector/Rule/Shared.hpp
@@ -1,5 +1,62 @@
 #pragma once
+#include <VTAll.hpp>
+#include <vector>
 
 namespace BMapInspector::Rule::Shared {
 
-}
+	namespace L = LibCmo;
+	namespace C = LibCmo::CK2;
+	namespace O = LibCmo::CK2::ObjImpls;
+
+#pragma region Constant Values
+
+	namespace GroupNames {
+		constexpr char8_t PHYS_FLOORRAILS[] = u8"Phys_FloorRails";
+	}
+
+	namespace TextureNames {
+		constexpr char8_t RAIL_ENVIRONMENT[] = u8"Rail_Environment.bmp";
+	}
+
+#pragma endregion
+
+#pragma region Check Functions
+
+	/**
+	 * @brief 
+	 * @param[in] ctx Can not be nullptr.
+	 * @param[in] name Can not be nullptr.
+	 * @return 
+	 */
+	O::CKGroup* FetchGroup(C::CKContext* ctx, L::CKSTRING name);
+	/**
+	 * @brief Check whether given CKTexture has the given file name (case-insensitive).
+	 * @param[in] tex Can not be nullptr.
+	 * @param[in] name Can not be nullptr.
+	 * @return True if it is, otherwise false.
+	 */
+	bool CheckTextureFileName(O::CKTexture* tex, L::CKSTRING name);
+
+	/**
+	 * @brief 
+	 * @param[in] group Can not be nullptr.
+	 * @return All objects is the child class of CK3dEntity.
+	 */
+	std::vector<O::CK3dEntity*> Iter3dEntities(O::CKGroup* group);
+	/**
+	 * @brief 
+	 * @param[in] mesh Can not be nullptr.
+	 * @return All nullptr reference are removed.
+	 */
+	std::vector<O::CKMaterial*> IterMaterial(O::CKMesh* mesh);
+
+	/**
+	 * @brief 
+	 * @param[in] obj Can not be nullptr.
+	 * @return 
+	 */
+	const char8_t* RenderObjectName(O::CKObject* obj);
+
+#pragma endregion
+
+} // namespace BMapInspector::Rule::Shared
diff --git a/Ballance/BMapInspector/Rule/YYCRules.cpp b/Ballance/BMapInspector/Rule/YYCRules.cpp
index e69de29..6e4ef54 100644
--- a/Ballance/BMapInspector/Rule/YYCRules.cpp
+++ b/Ballance/BMapInspector/Rule/YYCRules.cpp
@@ -0,0 +1,84 @@
+#include "YYCRules.hpp"
+#include "Shared.hpp"
+#include <set>
+
+namespace L = LibCmo;
+namespace C = LibCmo::CK2;
+namespace O = LibCmo::CK2::ObjImpls;
+
+namespace BMapInspector::Rule {
+
+#pragma region YYC Rule 1
+
+	constexpr char8_t YYC1[] = u8"YYC1";
+
+	YYCRule1::YYCRule1() {}
+
+	YYCRule1::~YYCRule1() {}
+
+	std::u8string_view YYCRule1::GetRuleName() const {
+		return YYC1;
+	}
+
+	void YYCRule1::Check(Reporter::Reporter& reporter, Map::Level& level) const {
+		auto* ctx = level.GetCKContext();
+
+		// We get "Phys_FloorRails" group first.
+		auto* phys_floorrails = Shared::FetchGroup(ctx, Shared::GroupNames::PHYS_FLOORRAILS);
+		if (phys_floorrails == nullptr) return;
+
+		// Create container holding smooth meshes
+		std::set<O::CKMesh*> smooth_meshes;
+		// We iterate all object grouped into it.
+		auto group_3dentities = Shared::Iter3dEntities(phys_floorrails);
+		for (auto* group_3dentity : group_3dentities) {
+			// Then we iterate their current meshes
+			auto* mesh = group_3dentity->GetCurrentMesh();
+			if (mesh == nullptr) continue;
+
+			// Iterate all meshes
+			auto mtls = Shared::IterMaterial(mesh);
+			for (auto* mtl : mtls) {
+				// Check whether all texture referred by this mesh are "Rail_Environment".
+				auto texture = mtl->GetTexture();
+				if (texture == nullptr) continue;
+				if (!Shared::CheckTextureFileName(texture, Shared::TextureNames::RAIL_ENVIRONMENT)) {
+					// No, this is not rail texture, throw error.
+					reporter.FormatError(
+					    YYC1,
+					    u8R"(Object "%s" is grouped into Phys_FloorRails, but its texture "%s" (referred by mesh %s and material %s) seems not the rail texture. This will cause this object be smooth unexpectly.)",
+					    Shared::RenderObjectName(group_3dentity),
+					    Shared::RenderObjectName(texture),
+					    Shared::RenderObjectName(mesh),
+					    Shared::RenderObjectName(mtl));
+				}
+			}
+
+			// Record this mesh into set.
+			smooth_meshes.emplace(mesh);
+		}
+
+		// Now we make sure that these smooth mesh is not referred by any other object.
+		// We iterate all 3d object first
+		auto all_3dobject = level.Get3dObjects();
+		for (auto* obj : all_3dobject) {
+			// Then we get its current mesh
+			auto* mesh = obj->GetCurrentMesh();
+			if (mesh == nullptr) continue;
+
+			// Check whether its mesh is in smooth mesh,
+			// and itself is not in "Phys_FloorRails" group
+			if (!obj->IsInGroup(phys_floorrails) && smooth_meshes.contains(mesh)) {
+				// Report error.
+				reporter.FormatError(
+				    YYC1,
+				    u8R"(Object "%s" is not grouped into Phys_FloorRails, but some objects grouped into Phys_FloorRails refer its mesh "%s". This will cause this object be smooth unexpectly.)",
+				    Shared::RenderObjectName(obj),
+				    Shared::RenderObjectName(mesh));
+			}
+		}
+	}
+
+#pragma endregion
+
+} // namespace BMapInspector::Rule
diff --git a/Ballance/BMapInspector/Rule/YYCRules.hpp b/Ballance/BMapInspector/Rule/YYCRules.hpp
index 1f4df78..5bb1fc7 100644
--- a/Ballance/BMapInspector/Rule/YYCRules.hpp
+++ b/Ballance/BMapInspector/Rule/YYCRules.hpp
@@ -2,5 +2,22 @@
 #include "../Rule.hpp"
 
 namespace BMapInspector::Rule {
-    
+
+	/**
+	 * @brief YYC12345 Rule 1
+	 * @details
+	 * The object grouped into "Phys_FloorRails" should only be rails, otherwise their meshes' UV will be smooth.
+	 * Additionally, these smooth UV meshes will also affect those objects refering them.
+	 */
+	class YYCRule1 : public IRule {
+	public:
+		YYCRule1();
+		~YYCRule1();
+		YYCC_DELETE_COPY_MOVE(YYCRule1)
+
+	public:
+		std::u8string_view GetRuleName() const override;
+		void Check(Reporter::Reporter& reporter, Map::Level& level) const override;
+	};
+
 }
diff --git a/LibCmo/LibCmo/CK2/MgrImpls/CKObjectManager.cpp b/LibCmo/LibCmo/CK2/MgrImpls/CKObjectManager.cpp
index c042902..e9e1d03 100644
--- a/LibCmo/LibCmo/CK2/MgrImpls/CKObjectManager.cpp
+++ b/LibCmo/LibCmo/CK2/MgrImpls/CKObjectManager.cpp
@@ -185,8 +185,8 @@ namespace LibCmo::CK2::MgrImpls {
 			}
 
 			// iterate all sub object and check name
-			for (const auto& objoff : m_ObjectsListByClass[i]) {
-				ObjImpls::CKObject* obj = m_ObjectsList[objoff];
+			for (const auto& objid : m_ObjectsListByClass[i]) {
+				ObjImpls::CKObject* obj = m_ObjectsList[Id2Offset(objid)];
 
 				if (name == nullptr) {
 					// directly add