diff --git a/src/bin/tetris/main.rs b/src/bin/tetris/main.rs
index 3c13adc..f0f1dcd 100644
--- a/src/bin/tetris/main.rs
+++ b/src/bin/tetris/main.rs
@@ -40,10 +40,11 @@ fn main() {
         .add_systems(
             Startup,
             (
-                init_world,
+                init_tetris,
                 init_debug_ui,
                 init_cameras,
                 init_ui.after(init_cameras),
+                init_battler,
             ),
         )
         // Input and basic systems
@@ -276,7 +277,7 @@ impl Display for ShapeStore {
 #[derive(Component)]
 struct GridBackground;
 
-fn init_world(
+fn init_tetris(
     mut commands: Commands,
     mut meshes: ResMut<Assets<Mesh>>,
     mut materials: ResMut<Assets<ColorMaterial>>,
@@ -313,6 +314,45 @@ fn init_world(
     });
 }
 
+fn init_battler(
+    mut commands: Commands,
+    mut meshes: ResMut<Assets<Mesh>>,
+    mut materials: ResMut<Assets<ColorMaterial>>,
+) {
+    {
+        let mat = materials.add(ColorMaterial {
+            color: BLUE.into(),
+            ..default()
+        });
+        let mesh = meshes.add(Ellipse::new(SCALE, SCALE * 2.0));
+        let t = Transform::from_xyz(-3.0 * SCALE, 0.0, 0.0);
+        commands.spawn((
+            Mesh2d(mesh),
+            MeshMaterial2d(mat),
+            t,
+            BATTLER,
+            Name::new("Protagonist"),
+        ));
+    }
+
+    {
+        let mat = materials.add(ColorMaterial {
+            color: RED.into(),
+            ..default()
+        });
+        let mesh = meshes.add(Ellipse::new(SCALE, SCALE));
+        let t = Transform::from_xyz(3.0 * SCALE, 0.0, 0.0);
+        commands.spawn((
+            Mesh2d(mesh),
+            MeshMaterial2d(mat),
+            t,
+            BATTLER,
+            Name::new("ENEMY"),
+        ));
+    }
+}
+
+
 #[derive(Resource, Default)]
 struct OutputImages {
     tetris: Handle<Image>,
@@ -366,6 +406,7 @@ fn init_cameras(
             Camera {
                 order: 1,
                 target,
+                clear_color: ClearColorConfig::Custom(WHITE.into()),
                 ..default()
             },
             TETRIS,
@@ -374,7 +415,8 @@ fn init_cameras(
     }
 
     {
-        let img = render_target_image((512, 512));
+        let (width, height) = (SCALE as u32 * Y_MAX as u32, SCALE as u32 * X_MAX as u32);
+        let img = render_target_image((width, height));
         let target = {
             let handle = images.add(img);
             output_images.battler = handle.clone();
@@ -390,6 +432,7 @@ fn init_cameras(
             Camera {
                 order: 2,
                 target,
+                clear_color: ClearColorConfig::Custom(WHITE.into()),
                 ..default()
             },
             BATTLER,
@@ -475,8 +518,8 @@ fn init_ui(mut commands: Commands, output_images: Res<OutputImages>, images: Res
         let img = images.get(&output_images.battler).unwrap();
         parent.spawn((
             Node {
-                width: Val::Px(img.size_f32().x * 0.5),
-                height: Val::Px(img.size_f32().y * 0.5),
+                width: Val::Px(img.size_f32().x * 0.75),
+                height: Val::Px(img.size_f32().y * 0.75),
                 ..default()
             },
             ImageNode {