diff --git a/include/MoveBG/MapObjCorona.hpp b/include/MoveBG/MapObjCorona.hpp
new file mode 100644
index 00000000..34df9065
--- /dev/null
+++ b/include/MoveBG/MapObjCorona.hpp
@@ -0,0 +1,54 @@
+#ifndef MOVE_BG_MAP_OBJ_CORONA_HPP
+#define MOVE_BG_MAP_OBJ_CORONA_HPP
+
+#include <MoveBG/MapObjBase.hpp>
+
+class TBathtub : public TMapObjBase {
+public:
+	TBathtub(const char*);
+
+	void loadAfter();
+	void hipdrop(const JGeometry::TVec3<f32>&);
+	void quake(const JGeometry::TVec3<f32>&);
+	u8 getNumGripsDead() const;
+	void tumble(f32, f32);
+	MtxPtr getTakingMtx();
+	MtxPtr getSubmarineMtxInDemo();
+	MtxPtr getPeachMtxInDemo();
+	MtxPtr getKoopaJrMtxInDemo();
+	BOOL receiveMessage(THitActor* sender, u32 message);
+	Mtx* getRootJointMtx() const;
+	void perform(u32, JDrama::TGraphics*);
+	void control();
+	void calcBathtubData();
+	void setupCollisions_();
+	void removeCollisions_(); // Unused
+	void startDemo();
+	bool allowsTumble() const;
+	void calcRootMatrix();
+	bool getNearGrip(const JGeometry::TVec3<f32>&, f32, f32*) const;
+	u8 getNextJuncture(const JGeometry::TVec3<f32>&,
+	                   const JGeometry::TVec3<f32>&) const;
+	u8 getNextGrip(const JGeometry::TVec3<f32>&, const JGeometry::TVec3<f32>&,
+	               f32, f32*) const;
+	void updatePosture_();
+	void load(JSUMemoryInputStream&);
+	u8 getNumKillerLaunchable() const;
+	bool isKillerAttackable() const;
+	u8 getNumKillerBurstable() const;
+	bool isBreaking() const;                                // Unused
+	bool isKillerLaunchable() const;                        // Unused
+	void showMessage(u32);                                  // Unused
+	u8 getNearJuncture(const JGeometry::TVec3<f32>&) const; // Unused
+	MtxPtr getKoopaMtxInDemo();                             // Unused
+	MtxPtr getWaterMtx(s32);                                // Unused
+	MtxPtr getShineEffectMtx();                             // Unused
+	MtxPtr getShineMtx();                                   // Unused
+	void liftMario(const JGeometry::TVec3<f32>&);           // Unused
+	void trample(const JGeometry::TVec3<f32>&);             // Unused
+
+public:
+	// Will start at 0x138
+};
+
+#endif
diff --git a/src/MoveBG/MapObjCorona.cpp b/src/MoveBG/MapObjCorona.cpp
index e69de29b..42e132e5 100644
--- a/src/MoveBG/MapObjCorona.cpp
+++ b/src/MoveBG/MapObjCorona.cpp
@@ -0,0 +1,102 @@
+#include "MoveBG/MapObjCorona.hpp"
+#include "MoveBG/MapObjBase.hpp"
+
+void TBathtub::loadAfter() { }
+
+void TBathtub::hipdrop(const JGeometry::TVec3<f32>&) { }
+
+void TBathtub::quake(const JGeometry::TVec3<f32>&) { }
+
+u8 TBathtub::getNumGripsDead() const { return 0; }
+
+void TBathtub::tumble(f32, f32) { }
+
+MtxPtr TBathtub::getTakingMtx() { return nullptr; }
+
+MtxPtr TBathtub::getSubmarineMtxInDemo() { return nullptr; }
+
+MtxPtr TBathtub::getPeachMtxInDemo() { return nullptr; }
+
+MtxPtr TBathtub::getKoopaJrMtxInDemo() { return nullptr; }
+
+BOOL TBathtub::receiveMessage(THitActor* sender, u32 message) { return false; }
+
+Mtx* TBathtub::getRootJointMtx() const { return nullptr; }
+
+void TBathtub::perform(u32, JDrama::TGraphics*) { }
+
+void TBathtub::control() { }
+
+void TBathtub::calcBathtubData() { }
+
+void TBathtub::setupCollisions_() { }
+
+void TBathtub::removeCollisions_() { } // Unused
+
+void TBathtub::startDemo() { }
+
+bool TBathtub::allowsTumble() const { return false; }
+
+void TBathtub::calcRootMatrix() { }
+
+bool TBathtub::getNearGrip(const JGeometry::TVec3<f32>&, f32, f32*) const
+{
+	return false;
+}
+
+u8 TBathtub::getNextJuncture(const JGeometry::TVec3<f32>&,
+                             const JGeometry::TVec3<f32>&) const
+{
+	return 0;
+}
+
+u8 TBathtub::getNextGrip(const JGeometry::TVec3<f32>&,
+                         const JGeometry::TVec3<f32>&, f32, f32*) const
+{
+	return 0;
+}
+
+void TBathtub::updatePosture_() { }
+
+TBathtub::TBathtub(const char* name)
+    : TMapObjBase(name)
+{
+}
+
+void TBathtub::load(JSUMemoryInputStream&) { }
+
+u8 TBathtub::getNumKillerLaunchable() const { return 0; }
+
+bool TBathtub::isKillerAttackable() const { return false; }
+
+u8 TBathtub::getNumKillerBurstable() const { return 0; }
+
+// Unused
+bool TBathtub::isBreaking() const { return false; }
+
+// Unused
+bool TBathtub::isKillerLaunchable() const { return false; }
+
+// Unused
+void TBathtub::showMessage(u32) { }
+
+// Unused
+u8 TBathtub::getNearJuncture(const JGeometry::TVec3<f32>&) const { return 0; }
+
+// Unused
+MtxPtr TBathtub::getKoopaMtxInDemo() { return nullptr; }
+
+// Unused
+MtxPtr TBathtub::getWaterMtx(s32) { return nullptr; }
+
+// Unused
+MtxPtr TBathtub::getShineEffectMtx() { return nullptr; }
+
+// Unused
+MtxPtr TBathtub::getShineMtx() { return nullptr; }
+
+// Unused
+void TBathtub::liftMario(const JGeometry::TVec3<f32>&) { }
+
+// Unused
+void TBathtub::trample(const JGeometry::TVec3<f32>&) { }