diff --git a/engines/tony/debugger.cpp b/engines/tony/debugger.cpp
index 8beb7285a4df..75e58d68d43e 100644
--- a/engines/tony/debugger.cpp
+++ b/engines/tony/debugger.cpp
@@ -30,6 +30,7 @@ namespace Tony {
 Debugger::Debugger() : GUI::Debugger() {
 	DCmd_Register("continue",		WRAP_METHOD(Debugger, Cmd_Exit));
 	DCmd_Register("scene",			WRAP_METHOD(Debugger, Cmd_Scene));
+	DCmd_Register("dirty_rects",	WRAP_METHOD(Debugger, Cmd_DirtyRects));
 }
 
 static int strToInt(const char *s) {
@@ -113,4 +114,17 @@ bool Debugger::Cmd_Scene(int argc, const char **argv) {
 	return false;
 }
 
+/**
+ * Turns showing dirty rects on or off
+ */
+bool Debugger::Cmd_DirtyRects(int argc, const char **argv) {
+	if (argc != 2) {
+		DebugPrintf("Usage; %s [on | off]\n", argv[0]);
+		return true;
+	} else {
+		_vm->_window.showDirtyRects(strcmp(argv[1], "on") == 0);
+		return false;
+	}
+}
+
 } // End of namespace Tony
diff --git a/engines/tony/debugger.h b/engines/tony/debugger.h
index c5ed5e417ef8..85ba9d75b677 100644
--- a/engines/tony/debugger.h
+++ b/engines/tony/debugger.h
@@ -35,6 +35,7 @@ class Debugger : public GUI::Debugger {
 
 protected:
 	bool Cmd_Scene(int argc, const char **argv);
+	bool Cmd_DirtyRects(int argc, const char **argv);
 };
 
 } // End of namespace Tony
diff --git a/engines/tony/window.cpp b/engines/tony/window.cpp
index bf0094ff2a43..a35e765b6c03 100644
--- a/engines/tony/window.cpp
+++ b/engines/tony/window.cpp
@@ -27,6 +27,7 @@
  */
 
 #include "common/scummsys.h"
+#include "graphics/surface.h"
 #include "util.h"
 #include "tony/window.h"
 #include "tony/game.h"
@@ -40,6 +41,7 @@ namespace Tony {
 \****************************************************************************/
 
 RMWindow::RMWindow() {
+	_showDirtyRects = false;
 }
 
 RMWindow::~RMWindow() {
@@ -126,11 +128,25 @@ void RMWindow::getNewFrame(RMGfxTargetBuffer &bigBuf, Common::Rect *rcBoundEllip
 		Common::List<Common::Rect> dirtyRects = bigBuf.getDirtyRects();
 		Common::List<Common::Rect>::iterator i;
 
+		// If showing dirty rects, copy the entire screen background and set up a surface pointer
+		Graphics::Surface *s = NULL;
+		if (_showDirtyRects) {
+			g_system->copyRectToScreen(lpBuf, RM_SX * 2, 0, 0, RM_SX, RM_SY);
+			s = g_system->lockScreen();
+		}
+
 		for (i = dirtyRects.begin(); i != dirtyRects.end(); ++i) {
 			Common::Rect &r = *i;
 			const byte *lpSrc = lpBuf + (RM_SX * 2) * r.top + (r.left * 2);
 			g_system->copyRectToScreen(lpSrc, RM_SX * 2, r.left, r.top, r.width(), r.height());
+
+			if (_showDirtyRects)
+				// Frame the copied area with a rectangle
+				s->frameRect(r, 0xffffff);
 		}
+
+		if (_showDirtyRects)
+			g_system->unlockScreen();
 	}
 
 	if (_bGrabThumbnail) {
diff --git a/engines/tony/window.h b/engines/tony/window.h
index 6189dd391fc7..562e5fe06270 100644
--- a/engines/tony/window.h
+++ b/engines/tony/window.h
@@ -57,14 +57,12 @@ class RMWindow {
 	void plotLines(const byte *lpBuf, const Common::Point &center, int x, int y);
 
 protected:
-//	void * /*LPDIRECTDRAWCLIPPER*/ _MainClipper;
-//	void * /*LPDIRECTDRAWCLIPPER*/ _BackClipper;
-
 	int fps, fcount;
 	int lastsecond, lastfcount;
 
 	int mskRed, mskGreen, mskBlue;
 	bool _wiping;
+	bool _showDirtyRects;
 
 	bool _bGrabScreenshot;
 	bool _bGrabThumbnail;
@@ -99,6 +97,7 @@ class RMWindow {
 	int getFps() const {
 		return fps;
 	}
+	void showDirtyRects(bool v) { _showDirtyRects = v; }
 };
 
 } // End of namespace Tony