diff --git a/tests/gfx/include/os-ctx.hpp b/tests/gfx/include/os-ctx.hpp
index e017b60..ae333ee 100644
--- a/tests/gfx/include/os-ctx.hpp
+++ b/tests/gfx/include/os-ctx.hpp
@@ -21,6 +21,8 @@ class OsCtx {
   virtual bool Mainloop() { return false; }
   virtual void ClearViewPort() {}
   virtual void SwapBuffers() {}
+  virtual int GetScreenCount() { return 1; }
+  virtual void DrawOnScreen(int s = 0) {}
   PD::fvec2 PositionTranslate(PD::fvec2 in) {
     return fvec2(in.x * pViewPort.x, in.y * pViewPort.y);
   }
diff --git a/tests/gfx/include/os/horizon-ctr.hpp b/tests/gfx/include/os/horizon-ctr.hpp
index 43e49b9..fb4e83c 100644
--- a/tests/gfx/include/os/horizon-ctr.hpp
+++ b/tests/gfx/include/os/horizon-ctr.hpp
@@ -13,6 +13,8 @@ class HorizonCtr : public PD::OsCtx {
   bool Mainloop() override;
   void ClearViewPort() override;
   void SwapBuffers() override;
+  int GetScreenCount() override { return 2; }
+  void DrawOnScreen(int s) override;
 
  private:
   struct Impl;
diff --git a/tests/gfx/source/main.cpp b/tests/gfx/source/main.cpp
index eeee77f..42602b4 100644
--- a/tests/gfx/source/main.cpp
+++ b/tests/gfx/source/main.cpp
@@ -208,11 +208,17 @@ int main(int argc, char** argv) {
   RightStick.pColor = "#00ffff";
   PD::UI7::Context ui7;
   ui7.GetIO().Font = &font;
+#ifdef __3DS__
+  ui7.AddViewPort("Default", PD::ivec4(0, 0, 320, 240));
+  ui7.GetIO().FontScale = 0.5f;
+#else
   ui7.AddViewPort("Default", PD::ivec4(0, 0, 1280, 720));
+#endif
   ui7.UseViewPort("Default");
   bool pMetricsWin = true;
   while (pOs->Mainloop()) {
     PD::TT::End("OSCTX::MainLoop");
+    pOs->DrawOnScreen(0);
     pOs->ClearViewPort();
     PD::TT::Scope __st("MainLoop");
     PD::TT::Beg("MainRaw");
@@ -324,7 +330,10 @@ int main(int argc, char** argv) {
     PD::TT::End("UI7::Context::Update");
     PD::Gfx::Reset();
     PD::TT::Beg("PD::Gfx::Draw");
+    pOs->DrawOnScreen(1);
+    pOs->ClearViewPort();
     PD::Gfx::Draw(ui7.GetDrawData());
+    pOs->DrawOnScreen(0);
     PD::Gfx::Draw(pList);
     PD::TT::End("PD::Gfx::Draw");
     pList.Clear();
diff --git a/tests/gfx/source/os/horizon-ctr.cpp b/tests/gfx/source/os/horizon-ctr.cpp
index 2ae73f9..fdbbbb6 100644
--- a/tests/gfx/source/os/horizon-ctr.cpp
+++ b/tests/gfx/source/os/horizon-ctr.cpp
@@ -16,6 +16,7 @@ struct HorizonCtr::Impl {
   C3D_RenderTarget* Top = nullptr;
   C3D_RenderTarget* Bottom = nullptr;
   uint32_t* pSocBuf = nullptr;
+  int CurrentScreen = 0;
 };
 
 void HorizonCtr::Init() {
@@ -63,13 +64,25 @@ bool HorizonCtr::Mainloop() {
   pViewPort = ivec2(400, 240);
   bool _kill = hidKeysUp() & KEY_START;
   C3D_FrameBegin(C3D_FRAME_SYNCDRAW);
+  impl->CurrentScreen = 0;
   return aptMainLoop() && !_kill;
 }
 
 void HorizonCtr::ClearViewPort() {
+  C3D_RenderTargetClear(impl->CurrentScreen ? impl->Bottom : impl->Top,
+                        C3D_CLEAR_ALL, PD::Color(25, 25, 25, 25), 0);
+}
+
+void HorizonCtr::DrawOnScreen(int s) {
+  impl->CurrentScreen = s;
+  if (s == 0) {
+    C3D_FrameDrawOn(impl->Top);
+    pViewPort = PD::ivec2(400, 240);
+  } else if (s == 1) {
+    C3D_FrameDrawOn(impl->Bottom);
+    pViewPort = PD::ivec2(320, 240);
+  }
   PD::Gfx::SetViewPort(pViewPort);
-  C3D_FrameDrawOn(impl->Top);
-  C3D_RenderTargetClear(impl->Top, C3D_CLEAR_ALL, PD::Color(25, 25, 25, 25), 0);
 }
 
 void HorizonCtr::SwapBuffers() { C3D_FrameEnd(0); }