diff --git a/src/main.rs b/src/main.rs
index efa686b..36feec1 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -35,7 +35,7 @@ fn main() -> Result<()> {
             println!();
             println!("Usage:");
             #[cfg(any(feature = "native", feature = "browser"))]
-            println!("  uw8 run [-t/--timeout <frames>] [--b/--browser] [-w/--watch] [-p/--pack] [-u/--uncompressed] [-l/--level] [-o/--output <out-file>] <file>");
+            println!("  uw8 run [-t/--timeout <frames>] [--no-gpu] [--b/--browser] [-w/--watch] [-p/--pack] [-u/--uncompressed] [-l/--level] [-o/--output <out-file>] <file>");
             println!("  uw8 pack [-u/--uncompressed] [-l/--level] <in-file> <out-file>");
             println!("  uw8 unpack <in-file> <out-file>");
             println!("  uw8 compile [-d/--debug] <in-file> <out-file>");
@@ -54,6 +54,8 @@ fn run(mut args: Arguments) -> Result<()> {
     let watch_mode = args.contains(["-w", "--watch"]);
     #[allow(unused)]
     let timeout: Option<u32> = args.opt_value_from_str(["-t", "--timeout"])?;
+    #[allow(unused)]
+    let gpu = !args.contains("--no-gpu");
 
     let mut config = Config::default();
     if args.contains(["-p", "--pack"]) {
@@ -93,7 +95,7 @@ fn run(mut args: Arguments) -> Result<()> {
         unimplemented!();
         #[cfg(feature = "native")]
         {
-            let mut microw8 = MicroW8::new(timeout)?;
+            let mut microw8 = MicroW8::new(timeout, gpu)?;
             if disable_audio {
                 microw8.disable_audio();
             }
diff --git a/src/run_native.rs b/src/run_native.rs
index 7b95f8b..058c5a3 100644
--- a/src/run_native.rs
+++ b/src/run_native.rs
@@ -48,7 +48,7 @@ struct UW8WatchDog {
 }
 
 impl MicroW8 {
-    pub fn new(timeout: Option<u32>) -> Result<MicroW8> {
+    pub fn new(timeout: Option<u32>, gpu: bool) -> Result<MicroW8> {
         let mut config = wasmtime::Config::new();
         config.cranelift_opt_level(wasmtime::OptLevel::Speed);
         if timeout.is_some() {
@@ -68,7 +68,7 @@ impl MicroW8 {
                 timeout: timeout.unwrap_or(0),
             };
 
-            uw8_window::run(move |framebuffer, gamepad, reset| {
+            uw8_window::run(gpu, move |framebuffer, gamepad, reset| {
                 while let Ok(instance) = to_ui_rx.try_recv() {
                     state.instance = instance;
                 }
@@ -245,10 +245,10 @@ impl State {
             let mut sound_regs = [0u8; 32];
             sound_regs.copy_from_slice(&memory[80..112]);
             if let Some(ref sound_tx) = instance.sound_tx {
-                sound_tx.send(RegisterUpdate {
+                let _ = sound_tx.send(RegisterUpdate {
                     time,
                     data: sound_regs,
-                })?;
+                });
             }
 
             let framebuffer_mem = &memory[120..(120 + 320 * 240)];
diff --git a/uw8-window/src/cpu.rs b/uw8-window/src/cpu.rs
index 6c997b0..044a91f 100644
--- a/uw8-window/src/cpu.rs
+++ b/uw8-window/src/cpu.rs
@@ -35,12 +35,25 @@ pub fn run(mut update: Box<dyn FnMut(&mut dyn Framebuffer, u32, bool) -> Instant
         if let Some(sleep) = next_frame.checked_duration_since(Instant::now()) {
             std::thread::sleep(sleep);
         }
+
+        let mut gamepad = 0;
+        for key in window.get_keys() {
+            if let Some(index) = GAMEPAD_KEYS
+                .iter()
+                .enumerate()
+                .find(|(_, &k)| k == key)
+                .map(|(i, _)| i)
+            {
+                gamepad |= 1 << index;
+            }
+        }
+
         next_frame = update(
             &mut CpuFramebuffer {
                 buffer: &mut buffer,
             },
-            0,
-            false,
+            gamepad,
+            window.is_key_pressed(Key::R, minifb::KeyRepeat::No),
         );
         window.update_with_buffer(&buffer, 320, 240).unwrap();
     }
diff --git a/uw8-window/src/lib.rs b/uw8-window/src/lib.rs
index befc8d8..cc113a5 100644
--- a/uw8-window/src/lib.rs
+++ b/uw8-window/src/lib.rs
@@ -3,13 +3,18 @@ use std::time::Instant;
 mod cpu;
 mod gpu;
 
-pub fn run<F: 'static + FnMut(&mut dyn Framebuffer, u32, bool) -> Instant>(update: F) -> ! {
-    match gpu::Window::new() {
-        Ok(window) => window.run(Box::new(update)),
-        Err(err) => eprintln!(
-            "Failed to create gpu window: {}\nFalling back to cpu window",
-            err
-        ),
+pub fn run<F: 'static + FnMut(&mut dyn Framebuffer, u32, bool) -> Instant>(
+    gpu: bool,
+    update: F,
+) -> ! {
+    if gpu {
+        match gpu::Window::new() {
+            Ok(window) => window.run(Box::new(update)),
+            Err(err) => eprintln!(
+                "Failed to create gpu window: {}\nFalling back to cpu window",
+                err
+            ),
+        }
     }
     cpu::run(Box::new(update));
 }