diff --git a/LEGO1/mxtransitionmanager.cpp b/LEGO1/mxtransitionmanager.cpp
index 12bd0931..c5a0cb27 100644
--- a/LEGO1/mxtransitionmanager.cpp
+++ b/LEGO1/mxtransitionmanager.cpp
@@ -4,16 +4,30 @@
 
 DECOMP_SIZE_ASSERT(MxTransitionManager, 0x900);
 
-// OFFSET: LEGO1 0x1004b8d0 STUB
+// OFFSET: LEGO1 0x1004b8d0
 MxTransitionManager::MxTransitionManager()
 {
-  // TODO
+  m_animationTimer = 0;
+  m_transitionType = NOT_TRANSITIONING;
+  m_ddSurface = NULL;
+  m_unk08 = 0;
+  m_unk1c = 0;
+  m_unk20.bit0 = FALSE;
+  m_unk28.bit0 = FALSE;
+  m_unk24 = 0;
 }
 
-// OFFSET: LEGO1 0x1004ba00 STUB
+// OFFSET: LEGO1 0x1004ba00
 MxTransitionManager::~MxTransitionManager()
 {
-  // TODO
+  free(m_unk1c);
+
+  if (m_unk08 != NULL) {
+    delete m_unk08->m_unk1c;
+    delete m_unk08;
+  }
+
+  TickleManager()->UnregisterClient(this);
 }
 
 // OFFSET: LEGO1 0x1004bac0 STUB
@@ -40,36 +54,43 @@ MxResult MxTransitionManager::GetDDrawSurfaceFromVideoManager() // vtable+0x14
 
 // OFFSET: LEGO1 0x1004bb70
 MxResult MxTransitionManager::StartTransition(TransitionType p_animationType, MxS32 p_speed,
-                                              undefined p_unk, MxBool p_playMusicInAnim)
+                                              MxBool p_unk, MxBool p_playMusicInAnim)
 {
-  // TODO: Incomplete and far from matching
-
   if (this->m_transitionType == NOT_TRANSITIONING) {
     if (!p_playMusicInAnim) {
       MxBackgroundAudioManager *backgroundAudioManager = BackgroundAudioManager();
       backgroundAudioManager->Stop();
     }
-      this->m_transitionType = p_animationType;
 
-      // TODO: This part of the function is mangled and I can't make out what it's doing right now
+    this->m_transitionType = p_animationType;
 
-      MxU32 time = timeGetTime();
-      this->m_systemTime = time;
+    m_unk20.bit0 = p_unk;
 
-      this->m_animationSpeed = p_speed;
+    if (m_unk20.bit0 && m_unk08 != NULL) {
+      m_unk08->vtable54(1);
 
-      MxTickleManager *tickleManager = TickleManager();
-      tickleManager->RegisterClient(this, p_speed);
+      MxTransitionManagerUnknownSubclass2 *iVar2 = m_unk08->m_unk1c;
+      iVar2->m_unk3c = 10000;
+      iVar2->m_unk30 |= 0x200;
+    }
 
-      LegoInputManager *inputManager = InputManager();
-      inputManager->m_unk88 = TRUE;
-      inputManager->m_unk336 = FALSE;
+    MxU32 time = timeGetTime();
+    this->m_systemTime = time;
 
-      LegoVideoManager *videoManager = VideoManager();
-      videoManager->SetUnkE4(FALSE);
+    this->m_animationSpeed = p_speed;
 
-      SetAppCursor(1);
-      return SUCCESS;
+    MxTickleManager *tickleManager = TickleManager();
+    tickleManager->RegisterClient(this, p_speed);
+
+    LegoInputManager *inputManager = InputManager();
+    inputManager->m_unk88 = TRUE;
+    inputManager->m_unk336 = FALSE;
+
+    LegoVideoManager *videoManager = VideoManager();
+    videoManager->SetUnkE4(FALSE);
+
+    SetAppCursor(1);
+    return SUCCESS;
   }
   return FAILURE;
-}
\ No newline at end of file
+}
diff --git a/LEGO1/mxtransitionmanager.h b/LEGO1/mxtransitionmanager.h
index 1b662e98..723366c1 100644
--- a/LEGO1/mxtransitionmanager.h
+++ b/LEGO1/mxtransitionmanager.h
@@ -5,6 +5,52 @@
 #include "mxvideopresenter.h"
 #include "legoomni.h"
 
+class MxTransitionManagerUnknownSubclass2
+{
+public:
+  virtual ~MxTransitionManagerUnknownSubclass2(){}
+
+  undefined m_unk04[0x2c];
+  undefined4 m_unk30;
+  undefined4 m_unk34;
+  undefined4 m_unk38;
+  undefined4 m_unk3c;
+
+};
+
+// TODO: Don't know what this is yet
+class MxTransitionManagerUnknownSubclass1
+{
+public:
+  virtual ~MxTransitionManagerUnknownSubclass1(){}
+
+  virtual void vtable04();
+  virtual void vtable08();
+  virtual void vtable0c();
+  virtual void vtable10();
+  virtual void vtable14();
+  virtual void vtable18();
+  virtual void vtable1c();
+  virtual void vtable20();
+  virtual void vtable24();
+  virtual void vtable28();
+  virtual void vtable2c();
+  virtual void vtable30();
+  virtual void vtable34();
+  virtual void vtable38();
+  virtual void vtable3c();
+  virtual void vtable40();
+  virtual void vtable44();
+  virtual void vtable48();
+  virtual void vtable4c();
+  virtual void vtable50();
+  virtual void vtable54(undefined4 p_unk1);
+
+  undefined m_unk04[0x18];
+  MxTransitionManagerUnknownSubclass2 *m_unk1c;
+
+};
+
 // VTABLE 0x100d7ea0
 class MxTransitionManager : public MxCore
 {
@@ -40,11 +86,19 @@ class MxTransitionManager : public MxCore
     BROKEN // Unknown what this is supposed to be, it locks the game up
   };
 
-  MxResult StartTransition(TransitionType p_animationType, MxS32 p_speed, undefined p_unk, MxBool p_playMusicInAnim);
+  MxResult StartTransition(TransitionType p_animationType, MxS32 p_speed, MxBool p_unk, MxBool p_playMusicInAnim);
 
 private:
-  undefined m_pad00[0x20];
-  undefined m_pad20[0x04];
+  MxTransitionManagerUnknownSubclass1 *m_unk08;
+  undefined4 m_unk0c;
+  undefined4 m_unk10;
+  undefined4 m_unk14;
+  undefined4 m_unk18;
+  void *m_unk1c;
+  flag_bitfield m_unk20;
+  undefined4 m_unk24;
+  flag_bitfield m_unk28;
+
   TransitionType m_transitionType;
   LPDIRECTDRAWSURFACE m_ddSurface;
   MxU16 m_animationTimer;
diff --git a/LEGO1/mxtypes.h b/LEGO1/mxtypes.h
index fc8d47b5..75f19d4a 100644
--- a/LEGO1/mxtypes.h
+++ b/LEGO1/mxtypes.h
@@ -44,4 +44,19 @@ typedef MxU8 MxBool;
 #define TWOCC(a, b) (((a) << 0) | ((b) << 8))
 #define FOURCC(a, b, c, d) (((a) << 0) | ((b) << 8) | ((c) << 16) | ((d) << 24))
 
+// Must be union with struct for match.
+typedef union {
+  struct {
+    MxU8 bit0: 1;
+    MxU8 bit1: 1;
+    MxU8 bit2: 1;
+    MxU8 bit3: 1;
+    MxU8 bit4: 1;
+    MxU8 bit5: 1;
+    MxU8 bit6: 1;
+    MxU8 bit7: 1;
+  };
+  // BYTE all; // ?
+} flag_bitfield;
+
 #endif // MXTYPE_H
diff --git a/LEGO1/mxvideoparamflags.h b/LEGO1/mxvideoparamflags.h
index f25ab4bd..8d1714ed 100644
--- a/LEGO1/mxvideoparamflags.h
+++ b/LEGO1/mxvideoparamflags.h
@@ -3,20 +3,7 @@
 
 #include <windows.h>
 
-// Must be union with struct for match.
-typedef union {
-  struct {
-    BYTE bit0: 1;
-    BYTE bit1: 1;
-    BYTE bit2: 1;
-    BYTE bit3: 1;
-    BYTE bit4: 1;
-    BYTE bit5: 1;
-    BYTE bit6: 1;
-    BYTE bit7: 1;
-  };
-  // BYTE all; // ?
-} flag_bitfield;
+#include "mxtypes.h"
 
 class MxVideoParamFlags
 {