diff --git a/src/CMakeLists.txt b/src/CMakeLists.txt
index b24f0f88..ccb91244 100644
--- a/src/CMakeLists.txt
+++ b/src/CMakeLists.txt
@@ -36,6 +36,7 @@ set(
   app/zelda3/sprite/sprite.cc
   app/zelda3/music/tracker.cc
   app/zelda3/dungeon/room.cc
+  app/zelda3/dungeon/room_object.cc
 )
 
 set(
diff --git a/src/app/gfx/scad_format.cc b/src/app/gfx/scad_format.cc
index df5465ff..52975507 100644
--- a/src/app/gfx/scad_format.cc
+++ b/src/app/gfx/scad_format.cc
@@ -15,6 +15,31 @@ namespace yaze {
 namespace app {
 namespace gfx {
 
+void FindMetastamp() {
+  int matching_position = -1;
+  bool matched = false;
+  Bytes cgx_rom;
+  Bytes raw_data_;
+  for (int i = 0;
+       i < cgx_rom.size() - sizeof(kMatchedBytes) - kOffsetFromMatchedBytesEnd;
+       i++) {
+    raw_data_.push_back(cgx_rom[i]);
+    bool is_match = std::equal(std::begin(kMatchedBytes),
+                               std::end(kMatchedBytes), &cgx_rom[i]);
+    if (is_match) {
+      matching_position = i;
+      matched = true;
+      break;
+    }
+  }
+  if (matched) {
+    int bpp_marker_position =
+        matching_position + sizeof(kMatchedBytes) + kOffsetFromMatchedBytesEnd;
+    int bpp_marker = cgx_rom[bpp_marker_position];
+    std::string bpp_type = (bpp_marker == 0x31) ? "8bpp" : "4bpp";
+  }
+}
+
 absl::Status LoadCgx(uint8_t bpp, std::string_view filename,
                      std::vector<uint8_t>& cgx_data,
                      std::vector<uint8_t>& cgx_loaded,
diff --git a/src/app/gfx/scad_format.h b/src/app/gfx/scad_format.h
index b5e4c5da..0ab42ce7 100644
--- a/src/app/gfx/scad_format.h
+++ b/src/app/gfx/scad_format.h
@@ -46,6 +46,11 @@ struct CgxHeader {
   uint8_t color_path[0x100];
 };
 
+constexpr uint16_t kMatchedBytes[] = {0x4E, 0x41, 0x4B, 0x31, 0x39, 0x38, 0x39};
+constexpr uint16_t kOffsetFromMatchedBytesEnd = 0x1D;
+
+void FindMetastamp();
+
 absl::Status LoadScr(std::string_view filename, uint8_t input_value,
                      std::vector<uint8_t>& map_data);
 
diff --git a/src/app/zelda3/screen/inventory.cc b/src/app/zelda3/screen/inventory.cc
index 49dc7477..1d771138 100644
--- a/src/app/zelda3/screen/inventory.cc
+++ b/src/app/zelda3/screen/inventory.cc
@@ -2,8 +2,9 @@
 
 #include "app/gfx/bitmap.h"
 #include "app/gfx/snes_tile.h"
-#include "app/rom.h"
 #include "app/gui/canvas.h"
+#include "app/rom.h"
+
 
 namespace yaze {
 namespace app {
@@ -16,10 +17,10 @@ void Inventory::Create() {
   }
   PRINT_IF_ERROR(BuildTileset())
   for (int i = 0; i < 0x500; i += 0x08) {
-    tiles_.push_back(gfx::GetTilesInfo(rom_.toint16(i + kBowItemPos)));
-    tiles_.push_back(gfx::GetTilesInfo(rom_.toint16(i + kBowItemPos + 0x02)));
-    tiles_.push_back(gfx::GetTilesInfo(rom_.toint16(i + kBowItemPos + 0x04)));
-    tiles_.push_back(gfx::GetTilesInfo(rom_.toint16(i + kBowItemPos + 0x08)));
+    tiles_.push_back(gfx::GetTilesInfo(rom()->toint16(i + kBowItemPos)));
+    tiles_.push_back(gfx::GetTilesInfo(rom()->toint16(i + kBowItemPos + 0x02)));
+    tiles_.push_back(gfx::GetTilesInfo(rom()->toint16(i + kBowItemPos + 0x04)));
+    tiles_.push_back(gfx::GetTilesInfo(rom()->toint16(i + kBowItemPos + 0x08)));
   }
   const int offsets[] = {0x00, 0x08, 0x800, 0x808};
   auto xx = 0;
@@ -63,13 +64,13 @@ void Inventory::Create() {
   }
   bitmap_.Create(256, 256, 128, data_);
   bitmap_.ApplyPalette(palette_);
-  rom_.RenderBitmap(&bitmap_);
+  rom()->RenderBitmap(&bitmap_);
 }
 
 absl::Status Inventory::BuildTileset() {
   tilesheets_.reserve(6 * 0x2000);
   for (int i = 0; i < 6 * 0x2000; i++) tilesheets_.push_back(0xFF);
-  ASSIGN_OR_RETURN(tilesheets_, rom_.Load2bppGraphics())
+  ASSIGN_OR_RETURN(tilesheets_, rom()->Load2bppGraphics())
   Bytes test;
   for (int i = 0; i < 0x4000; i++) {
     test_.push_back(tilesheets_[i]);
@@ -78,9 +79,9 @@ absl::Status Inventory::BuildTileset() {
     test_.push_back(tilesheets_[i]);
   }
   tilesheets_bmp_.Create(128, 0x130, 64, test_);
-  palette_ = rom_.GetPaletteGroup("hud")[0];
+  palette_ = rom()->GetPaletteGroup("hud")[0];
   tilesheets_bmp_.ApplyPalette(palette_);
-  rom_.RenderBitmap(&tilesheets_bmp_);
+  rom()->RenderBitmap(&tilesheets_bmp_);
   return absl::OkStatus();
 }
 
diff --git a/src/app/zelda3/screen/inventory.h b/src/app/zelda3/screen/inventory.h
index aa3027bf..9a50c9e9 100644
--- a/src/app/zelda3/screen/inventory.h
+++ b/src/app/zelda3/screen/inventory.h
@@ -14,9 +14,8 @@ namespace zelda3 {
 constexpr int kInventoryStart = 0x6564A;
 constexpr int kBowItemPos = 0x6F631;
 
-class Inventory {
+class Inventory : public SharedROM {
  public:
-  void SetupROM(ROM& rom) { rom_ = rom; }
   auto Bitmap() const { return bitmap_; }
   auto Tilesheet() const { return tilesheets_bmp_; }
   auto Palette() const { return palette_; }
@@ -26,8 +25,6 @@ class Inventory {
  private:
   absl::Status BuildTileset();
 
-  ROM rom_;
-
   Bytes data_;
   gfx::Bitmap bitmap_;
 
diff --git a/src/app/zelda3/sprite/sprite.h b/src/app/zelda3/sprite/sprite.h
index c8646820..770f65a4 100644
--- a/src/app/zelda3/sprite/sprite.h
+++ b/src/app/zelda3/sprite/sprite.h
@@ -39,6 +39,13 @@ class Sprite {
   auto GetRealX() const { return bounding_box_.x; }
   auto GetRealY() const { return bounding_box_.y; }
   auto id() const { return id_; }
+  auto x() const { return x_; }
+  auto y() const { return y_; }
+  auto nx() const { return nx_; }
+  auto ny() const { return ny_; }
+  auto layer() const { return layer_; }
+  auto subtype() const { return subtype_; }
+  auto& keyDrop() const { return key_drop_; }
 
   auto Width() const { return bounding_box_.w; }
   auto Height() const { return bounding_box_.h; }
@@ -47,6 +54,7 @@ class Sprite {
  private:
   Bytes current_gfx_;
   bool overworld_;
+
   uchar map_id_;
   uchar id_;
   uchar x_;
@@ -55,6 +63,10 @@ class Sprite {
   uchar ny_;
   uchar overlord_ = 0;
   std::string name_;
+
+  int subtype_;
+  int layer_;
+
   int map_x_;
   int map_y_;
   Bytes preview_gfx_;
@@ -67,6 +79,7 @@ class Sprite {
   int width_ = 16;
   int height_ = 16;
 
+  int key_drop_;
 };
 
 }  // namespace zelda3