diff --git a/source/platform/pretract.cpp b/source/platform/pretract.cpp
new file mode 100644
index 000000000..ad7038b61
--- /dev/null
+++ b/source/platform/pretract.cpp
@@ -0,0 +1,63 @@
+/*=========================================================================
+
+	pretract.cpp
+
+	Author:		CRB
+	Created: 
+	Project:	Spongebob
+	Purpose: 
+
+	Copyright (c) 2001 Climax Development Ltd
+
+===========================================================================*/
+
+#ifndef __PLATFORM_PRETRACT_H__
+#include "platform\pretract.h"
+#endif
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void CNpcRetractingPlatform::postInit()
+{
+	m_timer = NPC_PLATFORM_TIMER_RETRACT;
+}
+
+////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
+
+void CNpcRetractingPlatform::processTimer( int _frames )
+{
+	switch( m_timerType )
+	{
+		case NPC_PLATFORM_TIMER_RETRACT:
+		{
+			if ( m_timer > 0 )
+			{
+				m_timer -= _frames;
+			}
+			else
+			{
+				m_timer = 4 * GameState::getOneSecondInFrames();
+				m_timerType = NPC_PLATFORM_TIMER_EXTEND;
+				m_detectCollision = false;
+			}
+
+			break;
+		}
+
+		case NPC_PLATFORM_TIMER_EXTEND:
+		{
+			if ( m_timer > 0 )
+			{
+				m_timer -= _frames;
+			}
+			else
+			{
+				m_timer = 4 * GameState::getOneSecondInFrames();
+				m_timerType = NPC_PLATFORM_TIMER_RETRACT;
+				m_detectCollision = true;
+			}
+
+			break;
+		}
+	}
+}
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