diff --git a/src/main.rs b/src/main.rs
index e7a11a9..c83d288 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,3 +1,136 @@
-fn main() {
-    println!("Hello, world!");
+mod game;
+
+use std::cell::RefCell;
+
+use gtk::glib::clone;
+use gtk::{prelude::*, EditableLabel, Label, Switch};
+use gtk::{glib, Application, ApplicationWindow, Button, Box};
+use crate::game::*;
+
+const APP_ID: &str = "org.foxarmy.learn-hieroglyphs";
+
+fn main() -> glib::ExitCode {
+    let app = Application::builder().application_id(APP_ID).build();
+
+    let syllable = generate_random_hieroglyph(Kanas::Romaji);
+    let hiragana = get_kana_pair_for_hieroglyph(Kanas::Hiragana, &syllable);
+    let katakana = get_kana_pair_for_hieroglyph(Kanas::Katakana, &syllable);
+
+    println!("{syllable} = {hiragana} = {katakana}");
+
+    app.connect_activate(build_ui);
+
+    app.run()
+}
+
+fn build_menu(w: &RefCell<ApplicationWindow>) -> Box {
+    let romaji_to_kana = Button::builder()
+        .label("a->あ")
+        .margin_top(12)
+        .margin_end(48)
+        .build();
+    let kana_to_romaji = Button::builder()
+        .label("あ->a")
+        .margin_top(12)
+        .margin_end(12)
+        .margin_start(48)
+        .build();
+
+    let hiragana_switch: Switch = Switch::builder()
+        .name("enable hiragana")
+        .valign(gtk::Align::End)
+        .build();
+    let hiragana_label: Label = Label::builder()
+        .label("Enable hiragana")
+        .margin_start(12)
+        .build();
+
+    let katakana_switch: Switch = Switch::builder()
+        .name("enable katakana")
+        .build();
+    let katakana_label: Label = Label::builder()
+        .label("Enable katakana")
+        .margin_start(12)
+        .build();
+
+    let menu: Box = Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .halign(gtk::Align::Center)
+        .build();
+
+    let kanas_buttons: Box = Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .build();
+
+    let kanas_settings: Box = Box::builder()
+        .orientation(gtk::Orientation::Vertical)
+        .valign(gtk::Align::Center)
+        .halign(gtk::Align::Center)
+        .build();
+
+    let hiragana_setting: Box = Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .valign(gtk::Align::Center)
+        .halign(gtk::Align::Center)
+        .build();
+
+    let katakana_setting: Box = Box::builder()
+        .orientation(gtk::Orientation::Horizontal)
+        .valign(gtk::Align::Center)
+        .halign(gtk::Align::Center)
+        .build();
+
+    kanas_buttons.append(&romaji_to_kana);
+    kanas_buttons.append(&kana_to_romaji);
+    
+    hiragana_setting.append(&hiragana_switch);
+    hiragana_setting.append(&hiragana_label);
+    katakana_setting.append(&katakana_switch);
+    katakana_setting.append(&katakana_label);
+
+    kanas_settings.append(&hiragana_setting);
+    kanas_settings.append(&katakana_setting);
+
+    menu.append(&kanas_buttons);
+    menu.append(&kanas_settings);
+    kana_to_romaji.connect_clicked(clone!( @strong w => move |_button: &Button| {
+        w.borrow_mut().set_child(Some(&build_game(&w)));
+    }));
+    romaji_to_kana.connect_clicked(clone!( @strong w => move |_button: &Button| {
+        w.borrow_mut().set_child(Some(&build_game(&w)));
+    }));
+
+    menu
+}
+
+fn build_game(w: &RefCell<ApplicationWindow>) -> Box {
+    let game: Box = Box::builder()
+    .orientation(gtk::Orientation::Vertical)
+    .build();
+    let question_label: Label = Label::builder()
+        .label("placeholder")
+        .build();
+    let entry: EditableLabel = EditableLabel::builder()
+        .text("test")
+        .build();
+
+    game.append(&question_label);
+    game.append(&entry);
+
+    game
+}
+
+fn build_ui(app: &Application) {
+    let mut window: RefCell<ApplicationWindow> = RefCell::new(ApplicationWindow::builder()
+        .application(app)
+        .title("Test")
+        .default_height(920)
+        .default_width(480)
+        .build());
+
+    let menu = build_menu(&window);
+
+    window.get_mut().set_child(Some(&menu));
+
+    window.get_mut().present();
 }