diff --git a/crates/gui/src/button.rs b/crates/gui/src/button.rs
index b20426c8..4bde2572 100644
--- a/crates/gui/src/button.rs
+++ b/crates/gui/src/button.rs
@@ -1,4 +1,7 @@
-use bevy::{ecs::system::EntityCommands, prelude::*};
+use bevy::{
+    ecs::system::{EntityCommands, SystemParam},
+    prelude::*,
+};
 
 use crate::{GuiCommands, OuterStyle};
 
@@ -48,6 +51,33 @@ impl<'w, 's> ButtonCommands<'w, 's> for GuiCommands<'w, 's> {
     }
 }
 
+#[derive(SystemParam)]
+pub struct ButtonOps<'w, 's> {
+    button_query: Query<'w, 's, &'static Children, With<Button>>,
+    text_query: Query<'w, 's, &'static mut Text>,
+}
+
+impl<'w, 's> ButtonOps<'w, 's> {
+    /// This method changes text (e.g. caption) of a UI button.
+    ///
+    /// The entity must have [`Button`] component and at least one child with
+    /// [`Text`] component. The text must consist of a single section. If such
+    /// a child is found, its text is changed.
+    pub fn set_text(&mut self, entity: Entity, text: String) -> Result<(), &'static str> {
+        let Ok(children) = self.button_query.get(entity) else { return Err("Button does not exist.") };
+        for &child in children.iter() {
+            if let Ok(mut text_component) = self.text_query.get_mut(child) {
+                if text_component.sections.len() == 1 {
+                    text_component.sections[0].value = text;
+                    return Ok(());
+                }
+            }
+        }
+
+        Err("Button does not have a child with a single-section text..")
+    }
+}
+
 type ButtonInteractions<'w, 'q> = Query<
     'w,
     'q,
diff --git a/crates/gui/src/lib.rs b/crates/gui/src/lib.rs
index 49f0958d..415bddb9 100644
--- a/crates/gui/src/lib.rs
+++ b/crates/gui/src/lib.rs
@@ -3,8 +3,8 @@
 //! game.
 
 use bevy::{app::PluginGroupBuilder, prelude::PluginGroup};
-pub use button::ButtonCommands;
 use button::ButtonPlugin;
+pub use button::{ButtonCommands, ButtonOps};
 pub use commands::GuiCommands;
 use focus::FocusPlugin;
 pub use focus::SetFocusEvent;
diff --git a/crates/lobby/src/games/endpoints.rs b/crates/lobby/src/games/endpoints.rs
index ec077f67..c5612a79 100644
--- a/crates/lobby/src/games/endpoints.rs
+++ b/crates/lobby/src/games/endpoints.rs
@@ -30,7 +30,7 @@ async fn create(
 
     let game = Game::new(game_config, claims.username().to_owned());
     match games.create(game).await {
-        Ok(_) => HttpResponse::Ok().finish(),
+        Ok(_) => HttpResponse::Ok().json(()),
         Err(CreationError::NameTaken) => {
             warn!("Game creation error: game name is already taken.");
             HttpResponse::Conflict().json("Game name is already taken.")
@@ -66,7 +66,7 @@ async fn join(
     let name = path.into_inner();
 
     match games.add_player(claims.username(), name.as_str()).await {
-        Ok(_) => HttpResponse::Ok().finish(),
+        Ok(_) => HttpResponse::Ok().json(()),
         Err(AdditionError::AlreadyInAGame) => {
             warn!("Game joining error: a user is already in a different game.");
             HttpResponse::Forbidden().json("User is already in a different game.")
@@ -91,7 +91,7 @@ async fn leave(
     let name = path.into_inner();
 
     match games.remove_player(claims.username(), name.as_str()).await {
-        Ok(_) => HttpResponse::Ok().finish(),
+        Ok(_) => HttpResponse::Ok().json(()),
         Err(RemovalError::NotInTheGame) => {
             warn!("Game leaving error: the user is not in the game.");
             HttpResponse::Forbidden().json("The user is not in the game.")
diff --git a/crates/lobby_client/src/endpoints.rs b/crates/lobby_client/src/endpoints.rs
index 29a1659f..e3cd0478 100644
--- a/crates/lobby_client/src/endpoints.rs
+++ b/crates/lobby_client/src/endpoints.rs
@@ -74,7 +74,7 @@ impl LobbyRequestCreator for CreateGameRequest {
 
     fn create(&self, url: Url) -> Request {
         let mut request = Request::new(Method::POST, url);
-        *request.body_mut() = Some(serde_json::to_string(&self.0).unwrap().into());
+        json(&mut request, &self.0);
         request
     }
 }
diff --git a/crates/map/src/hash.rs b/crates/map/src/hash.rs
index f6aa8249..019c58c3 100644
--- a/crates/map/src/hash.rs
+++ b/crates/map/src/hash.rs
@@ -37,7 +37,7 @@ impl MapHash {
     }
 
     /// Converts the map hash into a hexadecimal string.
-    fn to_hex(&self) -> String {
+    pub fn to_hex(&self) -> String {
         let mut hex = String::with_capacity(64);
         for &byte in self.0.iter() {
             write!(&mut hex, "{byte:02x}").unwrap();
diff --git a/crates/map/src/meta.rs b/crates/map/src/meta.rs
index 0cdff696..1c65f626 100644
--- a/crates/map/src/meta.rs
+++ b/crates/map/src/meta.rs
@@ -11,7 +11,7 @@ pub const MAX_MAP_NAME_LEN: usize = 16;
 
 /// General information about a map. It does not hold full content of the map
 /// (i.e. location of objects on the map).
-#[derive(Serialize, Deserialize)]
+#[derive(Serialize, Deserialize, Clone)]
 pub struct MapMetadata {
     name: String,
     bounds: MapBounds,
diff --git a/crates/menu/src/create.rs b/crates/menu/src/create.rs
new file mode 100644
index 00000000..dce62f2e
--- /dev/null
+++ b/crates/menu/src/create.rs
@@ -0,0 +1,233 @@
+use bevy::prelude::*;
+use de_gui::{
+    ButtonCommands, ButtonOps, GuiCommands, LabelCommands, OuterStyle, TextBoxCommands, ToastEvent,
+};
+use de_lobby_model::GameMap;
+use de_map::hash::MapHash;
+use iyes_loopless::prelude::*;
+
+use crate::{
+    mapselection::{MapSelectedEvent, SelectMapEvent},
+    menu::Menu,
+    MenuState,
+};
+
+pub(crate) struct CreateGamePlugin;
+
+impl Plugin for CreateGamePlugin {
+    fn build(&self, app: &mut App) {
+        app.add_event::<CreateGameEvent>()
+            .add_enter_system(MenuState::GameCreation, setup)
+            .add_exit_system(MenuState::GameCreation, cleanup)
+            .add_system(
+                button_system
+                    .run_in_state(MenuState::GameCreation)
+                    .label(CreateLabel::Buttons),
+            )
+            .add_system(
+                map_selected_system
+                    .run_in_state(MenuState::GameCreation)
+                    .label(CreateLabel::MapSelected),
+            )
+            .add_system(
+                create_game_system
+                    .run_in_state(MenuState::GameCreation)
+                    .after(CreateLabel::Buttons)
+                    .after(CreateLabel::MapSelected),
+            );
+    }
+}
+
+#[derive(Copy, Clone, Hash, Debug, PartialEq, Eq, SystemLabel)]
+pub(crate) enum CreateLabel {
+    Buttons,
+    MapSelected,
+}
+
+#[derive(Component, Clone, Copy)]
+enum ButtonAction {
+    SelectMap,
+    Create,
+}
+
+#[derive(Resource)]
+struct Inputs {
+    map: Entity,
+}
+
+#[derive(Resource)]
+struct SelectedMap(GameMap);
+
+struct CreateGameEvent;
+
+fn setup(mut commands: GuiCommands, menu: Res<Menu>) {
+    let column_id = column(&mut commands, menu.root_node());
+
+    let name_row_id = row(&mut commands, column_id);
+    text_input(&mut commands, name_row_id, "Name");
+
+    let max_players_row_id = row(&mut commands, column_id);
+    text_input(&mut commands, max_players_row_id, "Max Players");
+
+    let map_row_id = row(&mut commands, column_id);
+    let map_id = map_button(&mut commands, map_row_id);
+
+    commands.insert_resource(Inputs { map: map_id });
+
+    let buttons_row_id = row(&mut commands, column_id);
+    let create_id = commands
+        .spawn_button(
+            OuterStyle {
+                size: Size::new(Val::Percent(100.), Val::Percent(100.)),
+                ..default()
+            },
+            "Create Game",
+        )
+        .insert(ButtonAction::Create)
+        .id();
+    commands.entity(buttons_row_id).add_child(create_id);
+}
+
+fn column(commands: &mut GuiCommands, parent_id: Entity) -> Entity {
+    let column_id = commands
+        .spawn(NodeBundle {
+            style: Style {
+                flex_direction: FlexDirection::Column,
+                size: Size::new(Val::Percent(50.), Val::Percent(100.)),
+                margin: UiRect::all(Val::Auto),
+                align_items: AlignItems::Center,
+                justify_content: JustifyContent::Center,
+                ..default()
+            },
+            ..default()
+        })
+        .id();
+    commands.entity(parent_id).add_child(column_id);
+    column_id
+}
+
+fn row(commands: &mut GuiCommands, parent_id: Entity) -> Entity {
+    let row_id = commands
+        .spawn(NodeBundle {
+            style: Style {
+                flex_direction: FlexDirection::Row,
+                size: Size::new(Val::Percent(100.), Val::Percent(8.)),
+                margin: UiRect::new(
+                    Val::Percent(0.),
+                    Val::Percent(0.),
+                    Val::Percent(2.),
+                    Val::Percent(2.),
+                ),
+                justify_content: JustifyContent::SpaceBetween,
+                align_items: AlignItems::Center,
+                ..default()
+            },
+            ..default()
+        })
+        .id();
+    commands.entity(parent_id).add_child(row_id);
+    row_id
+}
+
+fn text_input(commands: &mut GuiCommands, parent_id: Entity, caption: &str) -> Entity {
+    spawn_caption(commands, parent_id, caption);
+
+    let input_id = commands
+        .spawn_text_box(
+            OuterStyle {
+                size: Size::new(Val::Percent(65.), Val::Percent(100.)),
+                ..default()
+            },
+            false,
+        )
+        .id();
+    commands.entity(parent_id).add_child(input_id);
+    input_id
+}
+
+fn map_button(commands: &mut GuiCommands, parent_id: Entity) -> Entity {
+    spawn_caption(commands, parent_id, "Map");
+
+    let input_id = commands
+        .spawn_button(
+            OuterStyle {
+                size: Size::new(Val::Percent(65.), Val::Percent(100.)),
+                ..default()
+            },
+            "-",
+        )
+        .insert(ButtonAction::SelectMap)
+        .id();
+    commands.entity(parent_id).add_child(input_id);
+    input_id
+}
+
+fn spawn_caption(commands: &mut GuiCommands, parent_id: Entity, caption: &str) {
+    let caption_id = commands
+        .spawn_label(
+            OuterStyle {
+                size: Size::new(Val::Percent(35.), Val::Percent(100.)),
+                ..default()
+            },
+            caption,
+        )
+        .id();
+    commands.entity(parent_id).add_child(caption_id);
+}
+
+fn cleanup(mut commands: GuiCommands) {
+    commands.remove_resource::<Inputs>();
+    commands.remove_resource::<SelectedMap>();
+}
+
+fn button_system(
+    interactions: Query<(&Interaction, &ButtonAction), Changed<Interaction>>,
+    mut map_events: EventWriter<SelectMapEvent>,
+    mut create_events: EventWriter<CreateGameEvent>,
+) {
+    for (&interaction, &action) in interactions.iter() {
+        if let Interaction::Clicked = interaction {
+            match action {
+                ButtonAction::SelectMap => map_events.send(SelectMapEvent),
+                ButtonAction::Create => create_events.send(CreateGameEvent),
+            }
+        }
+    }
+}
+
+fn map_selected_system(
+    mut commands: Commands,
+    mut map_selected_events: EventReader<MapSelectedEvent>,
+    intpus: Res<Inputs>,
+    mut buttons: ButtonOps,
+    mut toasts: EventWriter<ToastEvent>,
+) {
+    let Some(event) = map_selected_events.iter().last() else { return };
+    let hash = match MapHash::try_from(event.path()) {
+        Ok(hash) => hash,
+        Err(error) => {
+            toasts.send(ToastEvent::new(format!("Map error: {error}")));
+            return;
+        }
+    };
+
+    buttons
+        .set_text(intpus.map, event.metadata().name().to_owned())
+        .unwrap();
+    commands.insert_resource(SelectedMap(GameMap::new(
+        hash.to_hex(),
+        event.metadata().name().to_owned(),
+    )));
+}
+
+fn create_game_system(
+    mut events: EventReader<CreateGameEvent>,
+    mut toasts: EventWriter<ToastEvent>,
+) {
+    // Always exhaust the iterator
+    if events.iter().count() == 0 {
+        return;
+    }
+
+    toasts.send(ToastEvent::new("Not yet implemented."));
+}
diff --git a/crates/menu/src/gamelisting.rs b/crates/menu/src/gamelisting.rs
index d1350029..ba9a9043 100644
--- a/crates/menu/src/gamelisting.rs
+++ b/crates/menu/src/gamelisting.rs
@@ -178,6 +178,7 @@ fn list_games_system(
 }
 
 fn button_system(
+    mut commands: Commands,
     interactions: Query<(&Interaction, &ButtonAction), Changed<Interaction>>,
     mut toasts: EventWriter<ToastEvent>,
 ) {
@@ -185,7 +186,7 @@ fn button_system(
         if let Interaction::Clicked = interaction {
             match action {
                 ButtonAction::Create => {
-                    toasts.send(ToastEvent::new("Not yet implemented (issue #326)."))
+                    commands.insert_resource(NextState(MenuState::GameCreation))
                 }
                 ButtonAction::Join => {
                     toasts.send(ToastEvent::new("Not yet implemented (issue #301)."))
diff --git a/crates/menu/src/lib.rs b/crates/menu/src/lib.rs
index 6f0144af..1bf1ef03 100644
--- a/crates/menu/src/lib.rs
+++ b/crates/menu/src/lib.rs
@@ -1,4 +1,5 @@
 use bevy::{app::PluginGroupBuilder, prelude::*};
+use create::CreateGamePlugin;
 use de_core::state::AppState;
 use gamelisting::GameListingPlugin;
 use iyes_loopless::prelude::*;
@@ -9,6 +10,7 @@ use menu::MenuPlugin;
 use signin::SignInPlugin;
 use singleplayer::SinglePlayerPlugin;
 
+mod create;
 mod gamelisting;
 mod mainmenu;
 mod mapselection;
@@ -28,6 +30,7 @@ impl PluginGroup for MenuPluginGroup {
             .add(SignInPlugin)
             .add(GameListingPlugin)
             .add(SinglePlayerPlugin)
+            .add(CreateGamePlugin)
     }
 }
 
@@ -47,6 +50,7 @@ pub(crate) enum MenuState {
     SinglePlayerGame,
     SignIn,
     GameListing,
+    GameCreation,
 }
 
 fn menu_entered_system(mut commands: Commands) {
diff --git a/crates/menu/src/mapselection.rs b/crates/menu/src/mapselection.rs
index 0821c5dc..169c06b2 100644
--- a/crates/menu/src/mapselection.rs
+++ b/crates/menu/src/mapselection.rs
@@ -46,17 +46,23 @@ pub(crate) struct SelectMapEvent;
 /// switched to a next state.
 pub(crate) struct MapSelectedEvent {
     path: PathBuf,
+    metadata: MapMetadata,
 }
 
 impl MapSelectedEvent {
-    fn new(path: PathBuf) -> Self {
-        Self { path }
+    fn new(path: PathBuf, metadata: MapMetadata) -> Self {
+        Self { path, metadata }
     }
 
     /// Path to the map on the local file system.
     pub(crate) fn path(&self) -> &Path {
         self.path.as_path()
     }
+
+    /// Selected map metadata.
+    pub(crate) fn metadata(&self) -> &MapMetadata {
+        &self.metadata
+    }
 }
 
 #[derive(Resource)]
@@ -165,7 +171,10 @@ fn button_system(
     for (&interaction, map) in interactions.iter() {
         if let Interaction::Clicked = interaction {
             commands.insert_resource(NextState(MapState::Off));
-            events.send(MapSelectedEvent::new(map.path().into()));
+            events.send(MapSelectedEvent::new(
+                map.path().into(),
+                map.metadata().clone(),
+            ));
         }
     }
 }
diff --git a/docs/content/lobby/openapi.yaml b/docs/content/lobby/openapi.yaml
index 09c94927..b64bd3b2 100644
--- a/docs/content/lobby/openapi.yaml
+++ b/docs/content/lobby/openapi.yaml
@@ -99,6 +99,10 @@ paths:
       responses:
         "200":
           description: The game was successfully crated and the user joined it.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/empty"
         "400":
           description: >-
             The game cannot be created because the request is invalid. This
@@ -125,6 +129,10 @@ paths:
       responses:
         "200":
           description: The user successfully joined the game.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/empty"
         "403":
           description: The user is already part of a game.
         "404":
@@ -147,6 +155,10 @@ paths:
       responses:
         "200":
           description: The user successfully left the game.
+          content:
+            application/json:
+              schema:
+                $ref: "#/components/schemas/empty"
         "403":
           description: The user is not part of the game.
 
@@ -158,6 +170,9 @@ components:
       bearerFormat: JWT
 
   schemas:
+    empty:
+      type: object
+      properties: {}
     token-response:
       type: object
       properties: