diff --git a/src/app/asm/script.cc b/src/app/asm/script.cc
new file mode 100644
index 00000000..1533d54c
--- /dev/null
+++ b/src/app/asm/script.cc
@@ -0,0 +1,36 @@
+#include "script.h"
+
+#include <asar.h>
+
+#include <array>
+#include <fstream>
+#include <sstream>
+
+#include "absl/status/statusor.h"
+#include "absl/strings/string_view.h"
+#include "app/core/constants.h"
+
+namespace yaze {
+namespace app {
+namespace snes_asm {
+
+absl::StatusOr<absl::string_view> GenerateMosaicChangeAssembly(
+    MosaicArray mosaic_tiles) {
+  std::fstream file("assets/asm/mosaic_change.asm",
+                    std::ios::out | std::ios::in);
+  if (!file.is_open()) {
+    return absl::InvalidArgumentError(
+        "Couldn't open mosaic change template file");
+  }
+  std::stringstream assembly;
+
+  assembly << absl::StrCat("org ", kDefaultMosaicHook);
+  assembly << file.rdbuf();
+
+  file.close();
+  return assembly.str();
+}
+
+}  // namespace snes_asm
+}  // namespace app
+}  // namespace yaze
\ No newline at end of file
diff --git a/src/app/asm/script.h b/src/app/asm/script.h
new file mode 100644
index 00000000..ccf66655
--- /dev/null
+++ b/src/app/asm/script.h
@@ -0,0 +1,28 @@
+#ifndef YAZE_APP_ASM_SCRIPT_H
+#define YAZE_APP_ASM_SCRIPT_H
+
+#include <asar.h>
+
+#include <array>
+#include <fstream>
+#include <sstream>
+
+#include "absl/status/statusor.h"
+#include "absl/strings/string_view.h"
+#include "app/core/constants.h"
+
+namespace yaze {
+namespace app {
+namespace snes_asm {
+
+using MosaicArray = std::array<int, core::kNumOverworldMaps>;
+constexpr char kDefaultMosaicHook[] = "$02AADB";
+
+absl::StatusOr<absl::string_view> GenerateMosaicChangeAssembly(
+    MosaicArray mosaic_tiles);
+
+}  // namespace snes_asm
+}  // namespace app
+}  // namespace yaze
+
+#endif
\ No newline at end of file
diff --git a/src/app/editor/screen_editor.cc b/src/app/editor/screen_editor.cc
index f60428f6..92096ed7 100644
--- a/src/app/editor/screen_editor.cc
+++ b/src/app/editor/screen_editor.cc
@@ -10,6 +10,7 @@
 
 #include "absl/status/statusor.h"
 #include "absl/strings/string_view.h"
+#include "app/asm/script.h"
 #include "app/core/common.h"
 #include "app/core/constants.h"
 #include "app/gfx/bitmap.h"
@@ -20,27 +21,6 @@ namespace yaze {
 namespace app {
 namespace editor {
 
-namespace {
-
-absl::StatusOr<absl::string_view> GenerateMosaicChangeAssembly(
-    MosaicArray mosaic_tiles) {
-  std::fstream file("assets/asm/mosaic_change.asm",
-                    std::ios::out | std::ios::in);
-  if (!file.is_open()) {
-    return absl::InvalidArgumentError(
-        "Couldn't open mosaic change template file");
-  }
-  std::stringstream assembly;
-
-  assembly << absl::StrCat("org ", kDefaultMosaicHook);
-  assembly << file.rdbuf();
-
-  file.close();
-  return assembly.str();
-}
-
-}  // namespace
-
 ScreenEditor::ScreenEditor() { screen_canvas_.SetCanvasSize(ImVec2(512, 512)); }
 
 void ScreenEditor::Update() {
@@ -58,7 +38,7 @@ void ScreenEditor::Update() {
 void ScreenEditor::DrawMosaicEditor() {
   TAB_ITEM("Mosaic Transitions")
   if (ImGui::Button("GenerateMosaicChangeAssembly")) {
-    auto mosaic = GenerateMosaicChangeAssembly(mosaic_tiles_);
+    auto mosaic = snes_asm::GenerateMosaicChangeAssembly(mosaic_tiles_);
     if (!mosaic.ok()) {
       std::cout << "Failed to generate mosaic change assembly";
     } else {
diff --git a/src/app/editor/screen_editor.h b/src/app/editor/screen_editor.h
index c4f17545..be92104a 100644
--- a/src/app/editor/screen_editor.h
+++ b/src/app/editor/screen_editor.h
@@ -3,6 +3,7 @@
 
 #include <imgui/imgui.h>
 
+#include "app/asm/script.h"
 #include "app/gfx/bitmap.h"
 #include "app/gfx/snes_tile.h"
 #include "app/zelda3/screen.h"
@@ -13,7 +14,6 @@ namespace app {
 namespace editor {
 
 using MosaicArray = std::array<int, core::kNumOverworldMaps>;
-constexpr char kDefaultMosaicHook[] = "$02AADB";
 
 class ScreenEditor {
  public:
@@ -32,7 +32,7 @@ class ScreenEditor {
   void DrawCanvas();
   void DrawToolset();
 
-  MosaicArray mosaic_tiles_;
+  snes_asm::MosaicArray mosaic_tiles_;
 
   zelda3::Screen current_screen_;
   gui::Canvas screen_canvas_;