diff --git a/src/app.rs b/src/app.rs
index 6f55039..2e0212a 100644
--- a/src/app.rs
+++ b/src/app.rs
@@ -84,7 +84,7 @@ impl Application {
             let proxy = proxy.clone();
             thread::spawn(|| process_gamepad_input(mappings, proxy));
         }
-        Self {
+        let app = Self {
             icon,
             wgpu,
             client,
@@ -106,7 +106,16 @@ impl Application {
             init_framebuffers: args.frame_buffers,
             init_registers: args.registers,
             init_terminal: args.terminal,
+        };
+        if args.player2 {
+            app.client
+                .send_command(EmulatorCommand::StartSecondSim(args.rom.clone()));
+
+            app.proxy
+                .send_event(UserEvent::OpenPlayer2)
+                .expect("Failed to open Player 2 window");
         }
+        app
     }
 
     fn open(&mut self, event_loop: &ActiveEventLoop, window: Box<dyn AppWindow>) {
diff --git a/src/config.rs b/src/config.rs
index 8ca3273..c762f64 100644
--- a/src/config.rs
+++ b/src/config.rs
@@ -40,6 +40,9 @@ pub struct CliArgs {
     /// Watch ROM files for changes, automatically reload
     #[arg(short, long)]
     pub watch: bool,
+    /// Automatically open Player 2 for multiplayer
+    #[arg(long)]
+    pub player2: bool,
 }
 
 pub const COLOR_PRESETS: [[Color32; 2]; 3] = [