diff --git a/README.md b/README.md
index b669a8c..8fada83 100644
--- a/README.md
+++ b/README.md
@@ -1,3 +1,5 @@
 # servicepoint-life
 
 More fully featured game of life for the servicepoint display based on the example in the repo.
+
+
diff --git a/src/app.rs b/src/app.rs
deleted file mode 100644
index 7a3a395..0000000
--- a/src/app.rs
+++ /dev/null
@@ -1,167 +0,0 @@
-use std::time::Duration;
-
-use crossterm::event;
-use crossterm::event::KeyCode::Modifier;
-use crossterm::event::{Event, KeyCode, KeyEvent, KeyEventKind};
-use log::{debug, info, warn};
-use rand::{distributions, Rng};
-use servicepoint2::Command::CharBrightness;
-use servicepoint2::{
-    ByteGrid, Command, CompressionCode, Connection, Origin, PixelGrid, TILE_HEIGHT, TILE_WIDTH,
-};
-
-use crate::Cli;
-
-pub(crate) struct App {
-    connection: Connection,
-    probability: f64,
-    field: PixelGrid,
-}
-
-impl App {
-    #[must_use]
-    pub fn new(connection: Connection, cli: &Cli) -> Self {
-        Self {
-            connection,
-            probability: cli.probability,
-            field: Self::make_random_field(cli.probability),
-        }
-    }
-
-    pub fn step(&mut self) -> bool {
-        self.send_image();
-        self.change_brightness();
-        self.field = self.game_iteration();
-
-        self.handle_events()
-    }
-
-    fn game_iteration(&self) -> PixelGrid {
-        let mut next = self.field.clone();
-        for x in 0..self.field.width() {
-            for y in 0..self.field.height() {
-                let old_state = self.field.get(x, y);
-                let neighbors = self.count_neighbors(x, y);
-
-                let new_state =
-                    matches!((old_state, neighbors), (true, 2) | (true, 3) | (false, 3));
-                next.set(x, y, new_state);
-            }
-        }
-        next
-    }
-
-    fn send_image(&self) {
-        let command = Command::BitmapLinearWin(
-            Origin(0, 0),
-            self.field.clone(),
-            CompressionCode::Uncompressed,
-        );
-
-        self.connection
-            .send(command.into())
-            .expect("could not send");
-    }
-
-    fn count_neighbors(&self, x: usize, y: usize) -> u8 {
-        let x = x as i32;
-        let y = y as i32;
-        let mut count = 0;
-        for nx in x - 1..=x + 1 {
-            for ny in y - 1..=y + 1 {
-                if nx == x && ny == y {
-                    continue; // the cell itself does not count
-                }
-
-                if nx < 0
-                    || ny < 0
-                    || nx >= self.field.width() as i32
-                    || ny >= self.field.height() as i32
-                {
-                    continue; // pixels outside the grid do not count
-                }
-
-                if !self.field.get(nx as usize, ny as usize) {
-                    continue; // dead cells do not count
-                }
-
-                count += 1;
-            }
-        }
-
-        count
-    }
-
-    fn make_random_field(probability: f64) -> PixelGrid {
-        let mut field = PixelGrid::max_sized();
-        let mut rng = rand::thread_rng();
-        let d = distributions::Bernoulli::new(probability).unwrap();
-        for x in 0..field.width() {
-            for y in 0..field.height() {
-                field.set(x, y, rng.sample(d));
-            }
-        }
-        field
-    }
-
-    fn handle_events(&mut self) -> bool {
-        if !event::poll(Duration::from_secs(0)).expect("could not poll") {
-            return true;
-        }
-
-        match event::read().expect("could not read event") {
-            Event::Key(key_event) if key_event.kind == KeyEventKind::Press => {
-                self.handle_key_press(key_event)
-            }
-            event => {
-                debug!("unhandled event {event:?}");
-                return true;
-            }
-        }
-    }
-
-    fn handle_key_press(&mut self, event: KeyEvent) -> bool {
-        match event.code {
-            KeyCode::Char('q') => {
-                warn!("q pressed, terminating");
-                return false;
-            }
-            KeyCode::Char(' ') => {
-                info!("generating new random field");
-                self.field = Self::make_random_field(self.probability);
-            }
-            key_code => {
-                debug!("unhandled KeyCode {key_code:?}");
-            }
-        }
-        true
-    }
-
-    fn change_brightness(&self) {
-        let mut rng = rand::thread_rng();
-
-        if !rng.gen_ratio(1, 10) {
-            return;
-        }
-
-        let min_size = 1;
-        let x = rng.gen_range(0..TILE_WIDTH - min_size);
-        let y = rng.gen_range(0..TILE_HEIGHT - min_size);
-
-        let w = rng.gen_range(min_size..=TILE_WIDTH - x);
-        let h = rng.gen_range(min_size..=TILE_HEIGHT - y);
-
-        let origin = Origin(x, y);
-        let mut luma = ByteGrid::new(w as usize, h as usize);
-
-        for y in 0..h as usize {
-            for x in 0..w as usize {
-                luma.set(x, y, rng.gen());
-            }
-        }
-
-        self.connection
-            .send(CharBrightness(origin, luma).into())
-            .expect("could not send brightness");
-    }
-}
diff --git a/src/game.rs b/src/game.rs
new file mode 100644
index 0000000..49d7a36
--- /dev/null
+++ b/src/game.rs
@@ -0,0 +1,101 @@
+use rand::Rng;
+use servicepoint2::{ByteGrid, PixelGrid, TILE_HEIGHT, TILE_WIDTH};
+
+pub(crate) struct Game {
+    pub field: PixelGrid,
+    pub luma: ByteGrid,
+}
+
+impl Game {
+    pub fn step(&mut self) {
+        let mut rng = rand::thread_rng();
+
+        self.field = self.field_iteration();
+
+        if rng.gen_ratio(1, 10) {
+            self.luma = self.luma_iteration();
+        }
+    }
+
+    fn field_iteration(&self) -> PixelGrid {
+        let mut next = self.field.clone();
+        for x in 0..self.field.width() {
+            for y in 0..self.field.height() {
+                let old_state = self.field.get(x, y);
+                let neighbors = self.count_neighbors(x, y);
+
+                let new_state =
+                    matches!((old_state, neighbors), (true, 2) | (true, 3) | (false, 3));
+                next.set(x, y, new_state);
+            }
+        }
+        next
+    }
+
+    fn count_neighbors(&self, x: usize, y: usize) -> u8 {
+        let x = x as i32;
+        let y = y as i32;
+        let mut count = 0;
+        for nx in x - 1..=x + 1 {
+            for ny in y - 1..=y + 1 {
+                if nx == x && ny == y {
+                    continue; // the cell itself does not count
+                }
+
+                if nx < 0
+                    || ny < 0
+                    || nx >= self.field.width() as i32
+                    || ny >= self.field.height() as i32
+                {
+                    continue; // pixels outside the grid do not count
+                }
+
+                if !self.field.get(nx as usize, ny as usize) {
+                    continue; // dead cells do not count
+                }
+
+                count += 1;
+            }
+        }
+
+        count
+    }
+
+    fn luma_iteration(&self) -> ByteGrid {
+        let mut rng = rand::thread_rng();
+
+        let min_size = 1;
+        let window_x = rng.gen_range(0..TILE_WIDTH as usize - min_size);
+        let window_y = rng.gen_range(0..TILE_HEIGHT as usize - min_size);
+
+        let w = rng.gen_range(min_size..=TILE_WIDTH as usize - window_x);
+        let h = rng.gen_range(min_size..=TILE_HEIGHT as usize - window_y);
+
+        let mut new_luma = self.luma.clone();
+        for inner_y in 0..h {
+            for inner_x in 0..w {
+                let x = window_x + inner_x;
+                let y = window_y + inner_y;
+                let old_value = self.luma.get(x, y);
+                let new_value = i32::clamp(
+                    old_value as i32 + rng.gen_range(-64..=64),
+                    u8::MIN as i32,
+                    u8::MAX as i32,
+                ) as u8;
+
+                new_luma.set(x, y, new_value);
+            }
+        }
+
+        new_luma
+    }
+}
+
+impl Default for Game {
+    fn default() -> Self {
+        Self {
+            field: PixelGrid::max_sized(),
+            luma: ByteGrid::new(TILE_WIDTH as usize, TILE_HEIGHT as usize),
+        }
+    }
+}
diff --git a/src/main.rs b/src/main.rs
index 038126c..716dfd5 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,24 +1,34 @@
+use std::io::stdout;
 use std::time::Duration;
 use std::{io, thread};
 
 use clap::Parser;
-use crossterm::execute;
+use crossterm::event::{Event, KeyCode, KeyEventKind};
+use crossterm::style::{Print, PrintStyledContent, Stylize};
 use crossterm::terminal::{EnterAlternateScreen, LeaveAlternateScreen};
+use crossterm::{event, execute};
 use log::LevelFilter;
-use servicepoint2::Connection;
+use rand::{distributions, Rng};
+use servicepoint2::Command::{BitmapLinearWin, CharBrightness};
+use servicepoint2::{
+    ByteGrid, CompressionCode, Connection, Origin, PixelGrid, PIXEL_WIDTH, TILE_HEIGHT, TILE_WIDTH,
+};
 
-use crate::app::App;
+use crate::game::Game;
 
-mod app;
+mod game;
 
 #[derive(Parser, Debug)]
 struct Cli {
     #[arg(short, long, default_value = "localhost:2342")]
     destination: String,
-    #[arg(short, long, default_value_t = 0.5f64)]
+    #[arg(short, long, default_value_t = 0.4f64)]
     probability: f64,
+    #[arg(short, long, default_value_t = true)]
+    extended: bool,
 }
 
+// TODO: itsa spaghetti! 👌
 fn main() {
     env_logger::builder()
         .filter_level(LevelFilter::Info)
@@ -33,14 +43,150 @@ fn main() {
 
     crossterm::terminal::enable_raw_mode().expect("could not enable raw terminal mode");
 
-    let mut app = App::new(connection, &cli);
-    while app.step() {
+    let mut left = Game::default();
+    let mut right = Game::default();
+
+    let mut pixels = PixelGrid::max_sized();
+    let mut luma = ByteGrid::new(TILE_WIDTH as usize, TILE_HEIGHT as usize);
+
+    let mut split_pixel = PIXEL_WIDTH as usize / 2;
+
+    let mut close_requested = false;
+    while !close_requested {
+        left.step();
+        right.step();
+
+        for x in 0..pixels.width() {
+            let left_or_right = if x < split_pixel {
+                &left.field
+            } else {
+                &right.field
+            };
+            for y in 0..pixels.height() {
+                let set = left_or_right.get(x, y) || x == split_pixel;
+                pixels.set(x, y, set);
+            }
+        }
+
+        let split_tile = split_pixel / 8;
+        for x in 0..luma.width() {
+            let left_or_right = if x < split_tile {
+                &left.luma
+            } else {
+                &right.luma
+            };
+            for y in 0..luma.height() {
+                let set = if x == split_tile {
+                    255
+                } else {
+                    left_or_right.get(x, y)
+                };
+                luma.set(x, y, set);
+            }
+        }
+
+        let pixel_cmd =
+            BitmapLinearWin(Origin(0, 0), pixels.clone(), CompressionCode::Uncompressed);
+        connection
+            .send(pixel_cmd.into())
+            .expect("could not send pixels");
+
+        connection
+            .send(CharBrightness(Origin(0, 0), luma.clone()).into())
+            .expect("could not send brightness");
+
+        while event::poll(Duration::from_secs(0)).expect("could not poll") {
+            match event::read().expect("could not read event") {
+                Event::Key(key_event) if key_event.kind == KeyEventKind::Press => {
+                    match key_event.code {
+                        KeyCode::Char('h') => {
+                            execute!(
+                                stdout(),
+                                Print("h for help\r\n"),
+                                Print("q to quit\r\n"),
+                                Print("a to reset left field\r\n"),
+                                Print("d to reset right field\r\n")
+                            )
+                            .unwrap();
+                        }
+                        KeyCode::Char('q') => {
+                            execute!(stdout(), PrintStyledContent("terminating\r\n".red()))
+                                .unwrap();
+                            close_requested = true;
+                        }
+                        KeyCode::Char('a') => {
+                            execute!(
+                                stdout(),
+                                PrintStyledContent(
+                                    "generating new random field for left\r\n".grey()
+                                )
+                            )
+                            .unwrap();
+                            left = make_random_field(cli.probability);
+                        }
+                        KeyCode::Char('d') => {
+                            execute!(
+                                stdout(),
+                                PrintStyledContent(
+                                    "generating new random field for right\r\n".grey()
+                                )
+                            )
+                            .unwrap();
+                            right = make_random_field(cli.probability);
+                        }
+                        KeyCode::Right => {
+                            split_pixel += 1;
+                        }
+                        KeyCode::Left => {
+                            split_pixel -= 1;
+                        }
+                        key_code => {
+                            execute!(
+                                stdout(),
+                                PrintStyledContent(
+                                    format!("unhandled KeyCode {key_code:?}\r\n").dark_grey()
+                                )
+                            )
+                            .unwrap();
+                        }
+                    }
+                }
+                event => {
+                    execute!(
+                        stdout(),
+                        PrintStyledContent(format!("unhandled event {event:?}\r\n").dark_grey()),
+                    )
+                    .unwrap();
+                }
+            }
+        }
+
         thread::sleep(Duration::from_millis(30));
     }
 
     crossterm::terminal::disable_raw_mode().expect("could not disable raw terminal mode");
 
     if entered_alternate {
-        execute!(io::stdout(), LeaveAlternateScreen).expect("could not leave alternate screen");
+        execute!(stdout(), LeaveAlternateScreen).expect("could not leave alternate screen");
     }
 }
+
+fn make_random_field(probability: f64) -> Game {
+    let mut field = PixelGrid::max_sized();
+    let mut rng = rand::thread_rng();
+    let d = distributions::Bernoulli::new(probability).unwrap();
+    for x in 0..field.width() {
+        for y in 0..field.height() {
+            field.set(x, y, rng.sample(d));
+        }
+    }
+
+    let mut luma = ByteGrid::new(TILE_WIDTH as usize, TILE_HEIGHT as usize);
+    for x in 0..luma.width() {
+        for y in 0..luma.height() {
+            luma.set(x, y, rng.gen());
+        }
+    }
+
+    Game { field, luma }
+}