diff --git a/engines/cge2/cge2.cpp b/engines/cge2/cge2.cpp
index 9e1e30a109f..6976a6fc82e 100644
--- a/engines/cge2/cge2.cpp
+++ b/engines/cge2/cge2.cpp
@@ -96,6 +96,8 @@ CGE2Engine::CGE2Engine(OSystem *syst, const ADGameDescription *gameDescription)
 	_sayCap = true;
 	_sayVox = true;
 	_req = 1;
+	_midiNotify = nullptr;
+	_spriteNotify = nullptr;
 }
 
 void CGE2Engine::init() {
diff --git a/engines/cge2/cge2.h b/engines/cge2/cge2.h
index 130b1bac080..c569bf94580 100644
--- a/engines/cge2/cge2.h
+++ b/engines/cge2/cge2.h
@@ -113,6 +113,8 @@ enum Action { kNear, kMTake, kFTake, kActions };
 
 enum ColorBank { kCBRel, kCBStd, kCBSay, kCBInf, kCBMnu, kCBWar };
 
+typedef void (CGE2Engine::*NotifyFunctionType)();
+
 class CGE2Engine : public Engine {
 private:
 	uint32 _lastFrame, _lastTick;
@@ -170,6 +172,7 @@ public:
 	Sprite *spriteAt(V2D pos);
 	void keyClick();
 	void swapInPocket(Sprite *spr, Sprite *xspr);
+	void busyStep();
 
 	void optionTouch(int opt, uint16 mask);
 	void switchColorMode();
@@ -262,6 +265,8 @@ public:
 	bool _sayCap;
 	bool _sayVox;
 	int _req;
+	NotifyFunctionType _midiNotify;
+	NotifyFunctionType _spriteNotify;
 
 	ResourceManager *_resman;
 	Vga *_vga;
diff --git a/engines/cge2/cge2_main.cpp b/engines/cge2/cge2_main.cpp
index 34e7cfe50fa..797dbe22d1f 100644
--- a/engines/cge2/cge2_main.cpp
+++ b/engines/cge2/cge2_main.cpp
@@ -648,7 +648,21 @@ void CGE2Engine::selectPocket(int n) {
 }
 
 void CGE2Engine::busy(bool on) {
-	warning("STUB: CGE2Engine::busy()");
+	if (on) {
+		_spriteNotify = _midiNotify = &CGE2::CGE2Engine::busyStep;
+		busyStep();
+	} else {
+		if (_busyPtr)
+			_busyPtr->step(0);
+		_spriteNotify = _midiNotify = nullptr;
+	}
+}
+
+void CGE2Engine::busyStep() {
+	if (_busyPtr) {
+		_busyPtr->step((_busyPtr->_seqPtr) ? -1 : 1);
+		_busyPtr->show(0);
+	}
 }
 
 void CGE2Engine::runGame() {
diff --git a/engines/cge2/sound.cpp b/engines/cge2/sound.cpp
index c657a37e461..652907b37de 100644
--- a/engines/cge2/sound.cpp
+++ b/engines/cge2/sound.cpp
@@ -190,7 +190,8 @@ void MusicPlayer::killMidi() {
 }
 
 void MusicPlayer::loadMidi(int ref) {
-	warning("STUB: MusicPlayer::loadMidi()"); // if (MidiNotify) MidiNotify();
+	if (_vm->_midiNotify != nullptr)
+		(_vm->*_vm->_midiNotify)();
 
 	// Work out the filename and check the given MIDI file exists
 	Common::String filename = Common::String::format("%.2dSG%.2d.MID", ref >> 8, ref & 0xFF);
diff --git a/engines/cge2/vga13h.cpp b/engines/cge2/vga13h.cpp
index 24376d91bb5..1c48a96210e 100644
--- a/engines/cge2/vga13h.cpp
+++ b/engines/cge2/vga13h.cpp
@@ -56,8 +56,6 @@ Seq *getConstantSeq(bool seqFlag) {
 	return seq;
 }
 
-void (*Sprite::notify)() = nullptr;
-
 byte Sprite::_constY = 0;
 byte Sprite::_follow = 0;
 
@@ -249,8 +247,8 @@ Sprite *Sprite::expand() {
 	if (_ext)
 		return this;
 
-	if (notify != nullptr)
-		notify();
+	if (_vm->_spriteNotify != nullptr)
+		(_vm->*_vm->_spriteNotify)();
 
 	_ext = new SprExt(_vm);
 	assert(_ext != NULL);
@@ -439,8 +437,8 @@ Sprite *Sprite::contract() {
 		curSeq->_dx = curSeq->_dy = curSeq->_dz = 0;
 	}
 
-	if (notify)
-		notify();
+	if (_vm->_spriteNotify != nullptr)
+		(_vm->*_vm->_spriteNotify)();
 
 	if (e->_name) {
 		delete[] e->_name;