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diff --git a/app/legion/gamemanager.h b/app/legion/gamemanager.h
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+++ b/app/legion/gamemanager.h
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+//========= Copyright Valve Corporation, All rights reserved. ============//
+//
+// Purpose: 
+//
+// $NoKeywords: $
+//===========================================================================//
+
+#ifndef GAMEMANAGER_H
+#define GAMEMANAGER_H
+#ifdef _WIN32
+#pragma once
+#endif
+
+#include "tier1/utlvector.h"
+
+
+//-----------------------------------------------------------------------------
+// State we are in
+//-----------------------------------------------------------------------------
+enum LevelState_t
+{
+	NOT_IN_LEVEL = 0,
+	LOADING_LEVEL,
+	IN_LEVEL,
+	SHUTTING_DOWN_LEVEL,
+};
+
+
+//-----------------------------------------------------------------------------
+// State we are in
+//-----------------------------------------------------------------------------
+enum LevelRetVal_t
+{
+	FAILED = 0,
+	MORE_WORK,
+	FINISHED,
+};
+
+
+//-----------------------------------------------------------------------------
+// Tick interval
+//-----------------------------------------------------------------------------
+#define TICK_INTERVAL	0.015f
+
+
+//-----------------------------------------------------------------------------
+// Game managers are singleton objects in the game code responsible for various tasks
+// The order in which the server systems appear in this list are the
+// order in which they are initialized and updated. They are shut down in
+// reverse order from which they are initialized.
+//-----------------------------------------------------------------------------
+abstract_class IGameManager
+{
+public:
+	// GameManagers are expected to implement these methods.
+	virtual bool Init() = 0;
+	virtual LevelRetVal_t LevelInit( bool bFirstCall ) = 0;
+	virtual void Update( ) = 0;
+	virtual LevelRetVal_t LevelShutdown( bool bFirstCall ) = 0;
+	virtual void Shutdown() = 0;
+	
+	// Called during game save
+	virtual void OnSave() = 0;
+
+	// Called during game restore
+	virtual void OnRestore() = 0;
+
+	// This this game manager involved in I/O or simulation?
+	virtual bool PerformsSimulation() = 0;
+
+	// Add, remove game managers
+	static void Add( IGameManager* pSys );
+	static void Remove( IGameManager* pSys );
+	static void RemoveAll( );
+
+	// Init, shutdown game managers
+	static bool InitAllManagers();
+	static void ShutdownAllManagers();
+
+	// Start, stop running game managers
+	static void Start ();
+	static void Stop ();
+	static int FrameNumber();
+
+	// Used in simulation
+	static float CurrentSimulationTime();
+	static float SimulationDeltaTime();
+
+	// Used in rendering
+	static float CurrentTime();
+	static float DeltaTime();
+
+	// Start loading a level
+	static void StartNewLevel();
+	static void ShutdownLevel();
+	static LevelState_t GetLevelState();
+
+protected:
+	// Updates the state machine related to loading levels
+	static void UpdateLevelStateMachine();	 
+
+	virtual ~IGameManager() {}
+
+	typedef LevelRetVal_t (IGameManager::*GameManagerLevelFunc_t)( bool bFirstCall );
+	typedef bool (IGameManager::*GameManagerInitFunc_t)();
+	typedef void (IGameManager::*GameManagerFunc_t)();
+
+	// Used to invoke a method of all added game managers in order
+	static void InvokeMethod( GameManagerFunc_t f );
+	static void InvokeMethodReverseOrder( GameManagerFunc_t f );
+	static bool InvokeMethod( GameManagerInitFunc_t f );
+	static LevelRetVal_t InvokeLevelMethod( GameManagerLevelFunc_t f, bool bFirstCall );
+	static LevelRetVal_t InvokeLevelMethodReverseOrder( GameManagerLevelFunc_t f, bool bFirstCall );
+
+	static bool m_bLevelShutdownRequested;
+	static bool m_bLevelStartRequested;
+	static bool m_bStopRequested;
+	static CUtlVector< IGameManager* > m_GameManagers;
+	static bool m_bIsRunning;
+	static bool m_bIsInitialized;
+	static int  m_nFrameNumber;
+	static float m_flCurrentTime;
+	static float m_flLastTime;
+	static LevelState_t m_LevelState;
+};
+
+
+//-----------------------------------------------------------------------------
+// Default decorator base-class for IGameManager
+//-----------------------------------------------------------------------------
+template< class BaseClass = IGameManager >
+class CGameManager : public BaseClass
+{
+public:
+	virtual ~CGameManager();
+
+	// GameManagers are expected to implement these methods.
+	// NOTE: If Init or LevelInit fail, they are expected to call 
+	virtual bool Init() { return true; }
+	virtual LevelRetVal_t LevelInit( bool bFirstCall ) { return FINISHED; }
+	virtual void Update( ) {}
+	virtual LevelRetVal_t LevelShutdown( bool bFirstCall ) { return FINISHED; }
+	virtual void Shutdown() {}
+	virtual void OnSave() {}
+	virtual void OnRestore() {}
+	virtual bool PerformsSimulation() { return false; }
+};
+
+
+//-----------------------------------------------------------------------------
+// Automatically remove the game system if it gets deleted.
+//-----------------------------------------------------------------------------
+template< class BaseClass >
+inline CGameManager< BaseClass >::~CGameManager()
+{
+	Remove( this );
+}
+
+
+#endif // GAMEMANAGER_H