diff --git a/src/app/gfx/snes_tile.cc b/src/app/gfx/snes_tile.cc
index 3e02f34b..78d43240 100644
--- a/src/app/gfx/snes_tile.cc
+++ b/src/app/gfx/snes_tile.cc
@@ -9,6 +9,53 @@ namespace yaze {
 namespace app {
 namespace gfx {
 
+Bytes SnesTo8bppSheet(Bytes sheet, int bpp) {
+  int xx = 0;  // positions where we are at on the sheet
+  int yy = 0;
+  int pos = 0;
+  int ypos = 0;
+  int num_tiles = 64;
+  int buffer_size = 0x1000;
+  if (bpp == 2) {
+    bpp = 16;
+    num_tiles = 128;
+    buffer_size = 0x2000;
+  } else if (bpp == 3) {
+    bpp = 24;
+  }
+  Bytes sheet_buffer_out(buffer_size);
+
+  for (int i = 0; i < num_tiles; i++) {  // for each tiles, 16 per line
+    for (int y = 0; y < 8; y++) {        // for each line
+      for (int x = 0; x < 8; x++) {      //[0] + [1] + [16]
+        auto b1 = (sheet[(y * 2) + (bpp * pos)] & (kGraphicsBitmap[x]));
+        auto b2 = (sheet[((y * 2) + (bpp * pos)) + 1] & (kGraphicsBitmap[x]));
+        auto b3 = (sheet[(16 + y) + (bpp * pos)] & (kGraphicsBitmap[x]));
+        unsigned char b = 0;
+        if (b1 != 0) {
+          b |= 1;
+        }
+        if (b2 != 0) {
+          b |= 2;
+        }
+        if (b3 != 0 && bpp != 16) {
+          b |= 4;
+        }
+        sheet_buffer_out[x + xx + (y * 128) + (yy * 1024)] = b;
+      }
+    }
+    pos++;
+    ypos++;
+    xx += 8;
+    if (ypos >= 16) {
+      yy++;
+      xx = 0;
+      ypos = 0;
+    }
+  }
+  return sheet_buffer_out;
+}
+
 TileInfo GetTilesInfo(ushort tile) {
   // vhopppcc cccccccc
   bool o = false;
diff --git a/src/app/gfx/snes_tile.h b/src/app/gfx/snes_tile.h
index 57c68677..901562f8 100644
--- a/src/app/gfx/snes_tile.h
+++ b/src/app/gfx/snes_tile.h
@@ -10,6 +10,11 @@ namespace yaze {
 namespace app {
 namespace gfx {
 
+constexpr uchar kGraphicsBitmap[8] = {0x80, 0x40, 0x20, 0x10,
+                                      0x08, 0x04, 0x02, 0x01};
+
+Bytes SnesTo8bppSheet(Bytes sheet, int bpp);
+
 struct tile8 {
   unsigned int id;
   char data[64];
diff --git a/src/app/rom.cc b/src/app/rom.cc
index 138e1c35..28de2fb0 100644
--- a/src/app/rom.cc
+++ b/src/app/rom.cc
@@ -21,6 +21,7 @@
 #include "app/core/common.h"
 #include "app/core/constants.h"
 #include "app/gfx/bitmap.h"
+#include "app/gfx/snes_tile.h"
 
 namespace yaze {
 namespace app {
@@ -352,53 +353,6 @@ int GetGraphicsAddress(const uchar* data, uint8_t offset) {
   return core::SnesToPc(snes_addr);
 }
 
-Bytes SnesTo8bppSheet(Bytes sheet, int bpp) {
-  int xx = 0;  // positions where we are at on the sheet
-  int yy = 0;
-  int pos = 0;
-  int ypos = 0;
-  int num_tiles = 64;
-  int buffer_size = 0x1000;
-  if (bpp == 2) {
-    bpp = 16;
-    num_tiles = 128;
-    buffer_size = 0x2000;
-  } else if (bpp == 3) {
-    bpp = 24;
-  }
-  Bytes sheet_buffer_out(buffer_size);
-
-  for (int i = 0; i < num_tiles; i++) {  // for each tiles, 16 per line
-    for (int y = 0; y < 8; y++) {        // for each line
-      for (int x = 0; x < 8; x++) {      //[0] + [1] + [16]
-        auto b1 = (sheet[(y * 2) + (bpp * pos)] & (kGraphicsBitmap[x]));
-        auto b2 = (sheet[((y * 2) + (bpp * pos)) + 1] & (kGraphicsBitmap[x]));
-        auto b3 = (sheet[(16 + y) + (bpp * pos)] & (kGraphicsBitmap[x]));
-        unsigned char b = 0;
-        if (b1 != 0) {
-          b |= 1;
-        }
-        if (b2 != 0) {
-          b |= 2;
-        }
-        if (b3 != 0 && bpp != 16) {
-          b |= 4;
-        }
-        sheet_buffer_out[x + xx + (y * 128) + (yy * 1024)] = b;
-      }
-    }
-    pos++;
-    ypos++;
-    xx += 8;
-    if (ypos >= 16) {
-      yy++;
-      xx = 0;
-      ypos = 0;
-    }
-  }
-  return sheet_buffer_out;
-}
-
 }  // namespace
 
 // TODO TEST compressed data border for each cmd
@@ -588,7 +542,7 @@ absl::StatusOr<Bytes> ROM::Load2bppGraphics() {
   for (const auto& sheet_id : sheets) {
     auto offset = GetGraphicsAddress(rom_data_.data(), sheet_id);
     ASSIGN_OR_RETURN(auto decomp_sheet, Decompress(offset))
-    auto converted_sheet = SnesTo8bppSheet(decomp_sheet, 2);
+    auto converted_sheet = gfx::SnesTo8bppSheet(decomp_sheet, 2);
     for (const auto& each_pixel : converted_sheet) {
       sheet.push_back(each_pixel);
     }
@@ -624,7 +578,7 @@ absl::Status ROM::LoadAllGraphicsData() {
     }
 
     if (bpp3) {
-      auto converted_sheet = SnesTo8bppSheet(sheet, 3);
+      auto converted_sheet = gfx::SnesTo8bppSheet(sheet, 3);
       graphics_bin_[i] =
           gfx::Bitmap(core::kTilesheetWidth, core::kTilesheetHeight,
                       core::kTilesheetDepth, converted_sheet.data(), 0x1000);
diff --git a/src/app/rom.h b/src/app/rom.h
index 9c33631b..6e961ed7 100644
--- a/src/app/rom.h
+++ b/src/app/rom.h
@@ -55,8 +55,6 @@ constexpr int kExpandedMod = 0xE0;
 constexpr int kExpandedLengthMod = 0x3FF;
 constexpr int kNormalLengthMod = 0x1F;
 constexpr int kCompressionStringMod = 7 << 5;
-constexpr uchar kGraphicsBitmap[8] = {0x80, 0x40, 0x20, 0x10,
-                                      0x08, 0x04, 0x02, 0x01};
 
 const std::string kMosaicChangeOffset = "$02AADB";
 constexpr int kSNESToPCOffset = 0x138000;