diff --git a/source/main.cpp b/source/main.cpp
index 5b2de5b..425fa7d 100644
--- a/source/main.cpp
+++ b/source/main.cpp
@@ -317,12 +317,65 @@ void mode_yellue(void) {
     }
 }
 
+static void mode_3d_moving_square() {
+    int ans = 0;
+    int z = 0;
+    gfxSet3D(true);
+    while (aptMainLoop() && ans != 1) {
+        static const int menu_size = 2;
+        static const s_uc_menu_element menu[] = {
+            {"z   ", true, &z, -100, 100},
+            {"back", false, NULL, 0, 0},
+        };
+        static auto menuVec = vector<s_uc_menu_element>(menu, menu + menu_size);
+
+        ans = uc_menu(menuVec);
+
+        gspWaitForVBlank();
+
+        static const u32 color_back = 0xFFFFFF;
+        static const u32 color_square = 0xFFFF00;
+        u16 width, height;
+        t_color *frame;
+        frame = (t_color *) gfxGetFramebuffer(
+                GFX_TOP, GFX_LEFT, &height, &width);
+        for (int i = 0; i < width * height; i++)
+        {
+            int x = i / height - z;
+            if (x < 0 || x >= width)
+                continue;
+            int y = height - i % height - 1;
+            if (x > 190 && x < 210 && y > 100 && y < 120)
+                rgb_set(frame[i], color_square);
+            else
+                rgb_set(frame[i], color_back);
+        }
+
+        frame = (t_color *) gfxGetFramebuffer(
+                GFX_TOP, GFX_RIGHT, &height, &width);
+        for (int i = 0; i < width * height; i++)
+        {
+            int x = i / height + z;
+            if (x < 0 || x >= width)
+                continue;
+            int y = height - i % height - 1;
+            if (x > 190 && x < 210 && y > 100 && y < 120)
+                rgb_set(frame[i], color_square);
+            else
+                rgb_set(frame[i], color_back);
+        }
+
+        gfxFlushBuffers();
+        gfxSwapBuffers();
+    }
+}
+
 int main(void) {;
     gfxInitDefault();
     consoleInit(GFX_BOTTOM, NULL);
 
     while (aptMainLoop()) {
-        static const int menu_size = 7;
+        static const int menu_size = 9;
         static const s_uc_menu_element menu[] = {
             {"ugly rainbow", false, NULL, 0, 0},
             {"direction", false, NULL, 0, 0},
@@ -331,9 +384,13 @@ int main(void) {;
             {"3D square", false, NULL, 0, 0},
             {"ugly 3D rainbow", false, NULL, 0, 0},
             {"yellue", false, NULL, 0, 0},
+            {"3D moving square", false, NULL, 0, 0},
+            {"quit", false, NULL, 0, 0},
         };
         static auto menuVec = vector<s_uc_menu_element>(menu, menu + menu_size);
         int ans = uc_menu(menuVec);
+        switch (ans)
+        {}
         if (ans == 0)
             mode_ugly_rainbow();
         if (ans == 1)
@@ -348,7 +405,11 @@ int main(void) {;
             mode_ugly_3d_rainbow();
         if (ans == 6)
             mode_yellue();
+        if (ans == 7)
+            mode_3d_moving_square();
+        if (ans == 8)
+            break;
         gfxSet3D(false);
     }
     gfxExit();
-}
\ No newline at end of file
+}