diff --git a/src/dusk/rpg/battle/CMakeLists.txt b/src/dusk/rpg/battle/CMakeLists.txt
index 5b0a546c..41f3315a 100644
--- a/src/dusk/rpg/battle/CMakeLists.txt
+++ b/src/dusk/rpg/battle/CMakeLists.txt
@@ -10,3 +10,6 @@ target_sources(${DUSK_LIBRARY_TARGET_NAME}
     battlefighter.c
     party.c
 )
+
+# Subdirs
+add_subdirectory(testbattle)
diff --git a/src/dusk/rpg/battle/testbattle/CMakeLists.txt b/src/dusk/rpg/battle/testbattle/CMakeLists.txt
new file mode 100644
index 00000000..790611c0
--- /dev/null
+++ b/src/dusk/rpg/battle/testbattle/CMakeLists.txt
@@ -0,0 +1,10 @@
+# Copyright (c) 2026 Dominic Masters
+#
+# This software is released under the MIT License.
+# https://opensource.org/licenses/MIT
+
+# Sources
+target_sources(${DUSK_LIBRARY_TARGET_NAME}
+  PUBLIC
+    testbattle.c
+)
diff --git a/src/dusk/rpg/battle/testbattle/testbattle.c b/src/dusk/rpg/battle/testbattle/testbattle.c
new file mode 100644
index 00000000..6ebf73d9
--- /dev/null
+++ b/src/dusk/rpg/battle/testbattle/testbattle.c
@@ -0,0 +1,43 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#include "testbattle.h"
+#include "rpg/battle/battle.h"
+#include "scene/scene.h"
+
+void testBattleStart(void) {
+  battleInit();
+
+  const battlefighterstats_t allyOneStats =
+    { .attack = 10, .defense = 5, .magic = 0, .speed = 10, .luck = 0 };
+  const battlefighterstats_t allyTwoStats =
+    { .attack = 8, .defense = 4, .magic = 0, .speed = 8, .luck = 0 };
+  const battlefighterstats_t enemyOneStats =
+    { .attack = 6, .defense = 3, .magic = 0, .speed = 6, .luck = 0 };
+  const battlefighterstats_t enemyTwoStats =
+    { .attack = 7, .defense = 3, .magic = 0, .speed = 5, .luck = 0 };
+
+  battleAddFighter(
+    BATTLE_FIGHTER_TEAM_ALLY, BATTLE_FIGHTER_CONTROLLER_PLAYER,
+    allyOneStats, 30, 10
+  );
+  battleAddFighter(
+    BATTLE_FIGHTER_TEAM_ALLY, BATTLE_FIGHTER_CONTROLLER_PLAYER,
+    allyTwoStats, 25, 10
+  );
+  battleAddFighter(
+    BATTLE_FIGHTER_TEAM_ENEMY, BATTLE_FIGHTER_CONTROLLER_AI,
+    enemyOneStats, 20, 5
+  );
+  battleAddFighter(
+    BATTLE_FIGHTER_TEAM_ENEMY, BATTLE_FIGHTER_CONTROLLER_AI,
+    enemyTwoStats, 20, 5
+  );
+
+  battleStart(BATTLE_ENCOUNTER_REGULAR, true);
+  sceneSet(SCENE_TYPE_BATTLE);
+}
diff --git a/src/dusk/rpg/battle/testbattle/testbattle.h b/src/dusk/rpg/battle/testbattle/testbattle.h
new file mode 100644
index 00000000..f2e4ab15
--- /dev/null
+++ b/src/dusk/rpg/battle/testbattle/testbattle.h
@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2026 Dominic Masters
+ *
+ * This software is released under the MIT License.
+ * https://opensource.org/licenses/MIT
+ */
+
+#pragma once
+#include "error/error.h"
+
+/**
+ * TEMPORARY test hook: sets up a hardcoded mock battle and switches to the
+ * battle scene, so the battle scene (camera/fighters/HUD) can be seen and
+ * played without a real encounter trigger yet.
+ */
+void testBattleStart(void);
diff --git a/src/dusk/ui/frame/mainmenu/uimainmenu.c b/src/dusk/ui/frame/mainmenu/uimainmenu.c
index 63918af9..8b224bcf 100644
--- a/src/dusk/ui/frame/mainmenu/uimainmenu.c
+++ b/src/dusk/ui/frame/mainmenu/uimainmenu.c
@@ -9,7 +9,7 @@
 #include "ui/frame/uiframe.h"
 #include "scene/scene.h"
 #include "engine/engine.h"
-#include "rpg/battle/battle.h"
+#include "rpg/battle/testbattle/testbattle.h"
 #include "save/save.h"
 #include "util/memory.h"
 #include "display/spritebatch/spritebatch.h"
@@ -23,42 +23,6 @@
 
 uimainmenu_t UI_MAIN_MENU;
 
-// TEMPORARY test hook: New Game starts a hardcoded mock battle instead of
-// the overworld, so the battle scene (camera/fighters/HUD) can be seen and
-// played without a real encounter trigger yet.
-void uiMainMenuStartTestBattle(void) {
-  battleInit();
-
-  const battlefighterstats_t allyOneStats =
-    { .attack = 10, .defense = 5, .magic = 0, .speed = 10, .luck = 0 };
-  const battlefighterstats_t allyTwoStats =
-    { .attack = 8, .defense = 4, .magic = 0, .speed = 8, .luck = 0 };
-  const battlefighterstats_t enemyOneStats =
-    { .attack = 6, .defense = 3, .magic = 0, .speed = 6, .luck = 0 };
-  const battlefighterstats_t enemyTwoStats =
-    { .attack = 7, .defense = 3, .magic = 0, .speed = 5, .luck = 0 };
-
-  battleAddFighter(
-    BATTLE_FIGHTER_TEAM_ALLY, BATTLE_FIGHTER_CONTROLLER_PLAYER,
-    allyOneStats, 30, 10
-  );
-  battleAddFighter(
-    BATTLE_FIGHTER_TEAM_ALLY, BATTLE_FIGHTER_CONTROLLER_PLAYER,
-    allyTwoStats, 25, 10
-  );
-  battleAddFighter(
-    BATTLE_FIGHTER_TEAM_ENEMY, BATTLE_FIGHTER_CONTROLLER_AI,
-    enemyOneStats, 20, 5
-  );
-  battleAddFighter(
-    BATTLE_FIGHTER_TEAM_ENEMY, BATTLE_FIGHTER_CONTROLLER_AI,
-    enemyTwoStats, 20, 5
-  );
-
-  battleStart(BATTLE_ENCOUNTER_REGULAR, true);
-  sceneSet(SCENE_TYPE_BATTLE);
-}
-
 void uiMainMenuSelected(
   const uimenu_t *menu,
   const uint8_t index,
@@ -71,7 +35,7 @@ void uiMainMenuSelected(
       // Resets the active slot to SAVE_DEFAULT in memory -- no disk I/O,
       // unlike Load Game (which will read a real slot via saveLoadSlot()).
       saveLoadDefault(SAVE_ACTIVE_SLOT);
-      uiMainMenuStartTestBattle();
+      testBattleStart();
       break;
 
     case UI_MAIN_MENU_INDEX_LOAD_GAME: