diff --git a/game/i18n/texts.csv b/game/i18n/texts.csv
index 6df10eb..984664a 100644
--- a/game/i18n/texts.csv
+++ b/game/i18n/texts.csv
@@ -8,3 +8,30 @@ INVENTORY_FULL,Die Tasche ist voll,Your bag is full
 PAUSED,Pause,Paused
 SIMULATION_STOPPED,Die Simulation wurde angehalten,The simulation stopped
 HELP,WASD: laufen · Linke Maustaste: Stein schlagen · F5: speichern · F9: laden · Esc: Pause,WASD: walk · Left mouse button: break rock · F5: save · F9: load · Esc: pause
+DEFAULT_NAME,Spieler,Player
+MENU_NAME,Dein Name,Your name
+MENU_SOLO,Allein spielen,Play alone
+MENU_HOST,Welt öffnen,Open your world
+MENU_ADDRESS,Adresse des Hosts,Address of the host
+MENU_JOIN,Beitreten,Join
+CONNECTING,Verbinde mit %s …,Connecting to %s …
+CONNECT_FAILED,Keine Verbindung zu %s,Could not reach %s
+ADDRESS_INVALID,Das ist keine Adresse: %s,That is not an address: %s
+HOST_LEFT,Der Host hat die Welt geschlossen,The host closed the world
+PROTOCOL_ERROR,Die Verbindung zum Host ist gestört,The connection to the host is broken
+REFUSED_OTHER_PROTOCOL,Der Host hat eine andere Version des Spiels,The host has another version of the game
+REFUSED_OTHER_RULES,Der Host hat andere Spielregeln. Ihr braucht denselben Stand des Spiels.,The host has other rules. You need the same version of the game.
+REFUSED_WORLD_FULL,Die Welt ist voll: Vier Spieler sind schon da,The world is full: four players are in it
+REFUSED_TOO_MANY_PLAYERS,Diese Welt kennt schon 16 Spieler und nimmt keine neuen mehr auf,This world knows 16 players already and takes no new ones
+REFUSED_ALREADY_PLAYING,Ein Spieler mit deinem Schlüssel ist schon in der Welt,A player with your key is in the world already
+STATUS_HOST,Welt offen auf Port %d · Spieler: %d,World open on port %d · players: %d
+STATUS_GUEST,Gast bei %s · Spieler: %d,Guest of %s · players: %d
+OPEN_FAILED,Port %d lässt sich nicht öffnen,Port %d cannot be opened
+PLAYER_JOINED,%s ist da,%s joined
+PLAYER_LEFT,%s ist gegangen,%s left
+RESYNCED,Welt mit dem Host abgeglichen,World matched with the host again
+PAUSE_ONLY_ALONE,Pause gibt es nur ohne Gäste,Pausing only works without guests
+LOAD_ONLY_ALONE,Laden gibt es nur beim Spielen allein,Loading only works when playing alone
+HOST_SAVES,Nur der Host speichert,Only the host saves
+KEY_UNREADABLE,Dein Spielerschlüssel lässt sich gerade nicht lesen,Your player key cannot be read right now
+SAVE_UNREADABLE,Der Spielstand lässt sich gerade nicht lesen,The save cannot be read right now
diff --git a/game/scripts/figures.gd b/game/scripts/figures.gd
new file mode 100644
index 0000000..0809836
--- /dev/null
+++ b/game/scripts/figures.gd
@@ -0,0 +1,63 @@
+class_name Figures
+extends Node2D
+## The figures of the other players, with their names. A new position comes
+## over the network about ten times a second; in between, each figure glides
+## toward the latest one.
+
+## How quickly a figure closes the gap to its latest position, per second.
+const GLIDE := 15.0
+const COLOR := Color(0.55, 0.8, 0.95)
+const OUTLINE := Color(0.05, 0.1, 0.15)
+const NAME_SIZE := 8
+const NAME_WIDTH := 80.0
+
+var session: GwSession
+var _shown: Dictionary[int, Vector2] = {}
+var _latest: Dictionary[int, Vector2] = {}
+
+
+## Moves the figure of `player` toward `position`. A figure that was not
+## shown yet appears there at once.
+func place(player: int, position: Vector2) -> void:
+	if not _shown.has(player):
+		_shown[player] = position
+	_latest[player] = position
+	queue_redraw()
+
+
+## Removes the figure of `player`.
+func forget(player: int) -> void:
+	_shown.erase(player)
+	_latest.erase(player)
+	queue_redraw()
+
+
+func clear() -> void:
+	_shown.clear()
+	_latest.clear()
+	queue_redraw()
+
+
+## Where the figure of `player` is shown, or Vector2.INF if it is not.
+func shown_at(player: int) -> Vector2:
+	return _shown.get(player, Vector2.INF)
+
+
+func _process(delta: float) -> void:
+	if _shown.is_empty():
+		return
+	var weight := minf(1.0, GLIDE * delta)
+	for player in _shown:
+		_shown[player] = _shown[player].lerp(_latest[player], weight)
+	queue_redraw()
+
+
+func _draw() -> void:
+	var font := ThemeDB.fallback_font
+	for player in _shown:
+		var at := _shown[player]
+		draw_circle(at, Avatar.RADIUS + 1.0, OUTLINE)
+		draw_circle(at, Avatar.RADIUS, COLOR)
+		if session != null:
+			var label := Vector2(at.x - NAME_WIDTH / 2.0, at.y - Avatar.RADIUS - 3.0)
+			draw_string(font, label, session.player_name(player), HORIZONTAL_ALIGNMENT_CENTER, NAME_WIDTH, NAME_SIZE)
diff --git a/game/scripts/figures.gd.uid b/game/scripts/figures.gd.uid
new file mode 100644
index 0000000..f3220f0
--- /dev/null
+++ b/game/scripts/figures.gd.uid
@@ -0,0 +1 @@
+uid://0krucvyguufx
diff --git a/game/scripts/hud.gd b/game/scripts/hud.gd
index e81b625..e46352e 100644
--- a/game/scripts/hud.gd
+++ b/game/scripts/hud.gd
@@ -1,11 +1,13 @@
 class_name Hud
 extends CanvasLayer
-## Text over the game: the stone count, short messages and a help line.
+## Text over the game: the stone count, short messages, a status line for
+## playing together and a help line.
 
 const MESSAGE_SECONDS := 2.5
 
 var _stone := Label.new()
 var _message := Label.new()
+var _status := Label.new()
 var _help := Label.new()
 var _message_left := 0.0
 
@@ -15,9 +17,12 @@ func _ready() -> void:
 	_stone.add_theme_font_size_override("font_size", 22)
 	_message.position = Vector2(16, 48)
 	_message.add_theme_font_size_override("font_size", 18)
+	_status.add_theme_font_size_override("font_size", 14)
+	_status.set_anchors_and_offsets_preset(Control.PRESET_TOP_RIGHT, Control.PRESET_MODE_MINSIZE, 16)
+	_status.grow_horizontal = Control.GROW_DIRECTION_BEGIN
 	_help.text = tr("HELP")
 	_help.add_theme_font_size_override("font_size", 14)
-	for label: Label in [_stone, _message, _help]:
+	for label: Label in [_stone, _message, _status, _help]:
 		label.add_theme_color_override("font_outline_color", Color.BLACK)
 		label.add_theme_constant_override("outline_size", 4)
 		add_child(label)
@@ -36,9 +41,10 @@ func show_stone(count: int) -> void:
 	_stone.text = tr("STONE_COUNT") % count
 
 
-## Shows the text for `key` for a few seconds.
-func flash(key: String) -> void:
-	_message.text = tr(key)
+## Shows the text for `key` for a few seconds, with `values` filled into
+## its placeholders.
+func flash(key: String, values: Array = []) -> void:
+	_message.text = tr(key) % values if not values.is_empty() else tr(key)
 	_message_left = MESSAGE_SECONDS
 
 
@@ -48,6 +54,16 @@ func show_paused(paused: bool) -> void:
 	_message_left = 0.0
 
 
+## Shows `text` in the top right corner until it is replaced.
+func show_status(text: String) -> void:
+	_status.text = text
+
+
+## The text currently shown in the status line. Tests read it.
+func status_text() -> String:
+	return _status.text
+
+
 ## The text currently shown as a message. Tests read it.
 func message() -> String:
 	return _message.text
diff --git a/game/scripts/menu.gd b/game/scripts/menu.gd
new file mode 100644
index 0000000..2c8e515
--- /dev/null
+++ b/game/scripts/menu.gd
@@ -0,0 +1,65 @@
+class_name Menu
+extends CanvasLayer
+## The start screen: the player's name, then playing alone, opening the world
+## for guests, or joining a host.
+
+signal play_chosen(open: bool)
+signal join_chosen(address: String)
+
+var name_field := LineEdit.new()
+var address_field := LineEdit.new()
+var solo_button := Button.new()
+var host_button := Button.new()
+var join_button := Button.new()
+var _status := Label.new()
+
+
+func _ready() -> void:
+	var center := CenterContainer.new()
+	center.set_anchors_and_offsets_preset(Control.PRESET_FULL_RECT)
+	add_child(center)
+	var panel := PanelContainer.new()
+	center.add_child(panel)
+	var box := VBoxContainer.new()
+	box.custom_minimum_size = Vector2(380, 0)
+	box.add_theme_constant_override("separation", 10)
+	panel.add_child(box)
+
+	var title := Label.new()
+	title.text = "Grovewright"
+	title.horizontal_alignment = HORIZONTAL_ALIGNMENT_CENTER
+	title.add_theme_font_size_override("font_size", 32)
+	name_field.placeholder_text = tr("MENU_NAME")
+	name_field.max_length = 32
+	solo_button.text = tr("MENU_SOLO")
+	host_button.text = tr("MENU_HOST")
+	var row := HBoxContainer.new()
+	for button in [solo_button, host_button]:
+		button.size_flags_horizontal = Control.SIZE_EXPAND_FILL
+		row.add_child(button)
+	address_field.placeholder_text = tr("MENU_ADDRESS")
+	join_button.text = tr("MENU_JOIN")
+	_status.autowrap_mode = TextServer.AUTOWRAP_WORD_SMART
+	_status.custom_minimum_size = Vector2(380, 0)
+	for control: Control in [title, name_field, row, HSeparator.new(), address_field, join_button, _status]:
+		box.add_child(control)
+
+	solo_button.pressed.connect(func() -> void: play_chosen.emit(false))
+	host_button.pressed.connect(func() -> void: play_chosen.emit(true))
+	join_button.pressed.connect(func() -> void: join_chosen.emit(address_field.text.strip_edges()))
+	address_field.text_submitted.connect(func(_text: String) -> void: join_button.pressed.emit())
+
+
+## Shows `text` below the buttons.
+func show_status(text: String) -> void:
+	_status.text = text
+
+
+## The text shown below the buttons. Tests read it.
+func status() -> String:
+	return _status.text
+
+
+## The name the player typed, without spaces around it.
+func player_name() -> String:
+	return name_field.text.strip_edges()
diff --git a/game/scripts/menu.gd.uid b/game/scripts/menu.gd.uid
new file mode 100644
index 0000000..adfd865
--- /dev/null
+++ b/game/scripts/menu.gd.uid
@@ -0,0 +1 @@
+uid://dppcwwh67rtu6
diff --git a/game/tests/test_figures.gd b/game/tests/test_figures.gd
new file mode 100644
index 0000000..31cf682
--- /dev/null
+++ b/game/tests/test_figures.gd
@@ -0,0 +1,34 @@
+extends TestCase
+
+
+func test_a_figure_appears_where_it_is_first_placed() -> void:
+	var figures := Figures.new()
+	check_eq(figures.shown_at(2), Vector2.INF, "nobody is shown at first")
+	figures.place(2, Vector2(10.0, 20.0))
+	check_eq(figures.shown_at(2), Vector2(10.0, 20.0), "at once at its first position")
+	figures.free()
+
+
+func test_a_figure_glides_toward_its_latest_position() -> void:
+	var figures := Figures.new()
+	figures.place(1, Vector2.ZERO)
+	figures.place(1, Vector2(100.0, 0.0))
+	figures._process(0.02)
+	var halfway := figures.shown_at(1).x
+	check(halfway > 0.0 and halfway < 100.0, "part of the way after a frame: %s" % halfway)
+	for frame in 60:
+		figures._process(0.02)
+	check(figures.shown_at(1).distance_to(Vector2(100.0, 0.0)) < 0.01, "there after a second")
+	figures.free()
+
+
+func test_figures_can_be_forgotten() -> void:
+	var figures := Figures.new()
+	figures.place(1, Vector2.ZERO)
+	figures.place(3, Vector2.ONE)
+	figures.forget(1)
+	check_eq(figures.shown_at(1), Vector2.INF, "one is gone")
+	check_eq(figures.shown_at(3), Vector2.ONE, "the other stays")
+	figures.clear()
+	check_eq(figures.shown_at(3), Vector2.INF, "all are gone")
+	figures.free()
diff --git a/game/tests/test_figures.gd.uid b/game/tests/test_figures.gd.uid
new file mode 100644
index 0000000..693c9a2
--- /dev/null
+++ b/game/tests/test_figures.gd.uid
@@ -0,0 +1 @@
+uid://x5pqgp2p1hku
diff --git a/game/tests/test_hud.gd b/game/tests/test_hud.gd
new file mode 100644
index 0000000..6d1019d
--- /dev/null
+++ b/game/tests/test_hud.gd
@@ -0,0 +1,32 @@
+extends TestCase
+
+
+func _hud() -> Hud:
+	I18n.install()
+	var hud := Hud.new()
+	tree.root.add_child(hud)
+	return hud
+
+
+func _free(hud: Hud) -> void:
+	tree.root.remove_child(hud)
+	hud.free()
+
+
+func test_a_message_can_carry_values() -> void:
+	var hud := _hud()
+	hud.flash("PLAYER_JOINED", ["Grace"])
+	check_eq(hud.message(), tr("PLAYER_JOINED") % "Grace", "the name is filled in")
+	hud.flash("SAVED")
+	check_eq(hud.message(), tr("SAVED"), "a message without values")
+	_free(hud)
+
+
+func test_the_status_line_stays_until_it_is_replaced() -> void:
+	var hud := _hud()
+	hud.show_status(tr("STATUS_HOST") % [24680, 2])
+	hud.flash("SAVED")
+	hud._process(10.0)
+	check_eq(hud.message(), "", "the message is gone after a while")
+	check_eq(hud.status_text(), tr("STATUS_HOST") % [24680, 2], "the status line is not")
+	_free(hud)
diff --git a/game/tests/test_hud.gd.uid b/game/tests/test_hud.gd.uid
new file mode 100644
index 0000000..8e0b698
--- /dev/null
+++ b/game/tests/test_hud.gd.uid
@@ -0,0 +1 @@
+uid://8e4vlt0gnipa
diff --git a/game/tests/test_menu.gd b/game/tests/test_menu.gd
new file mode 100644
index 0000000..7238019
--- /dev/null
+++ b/game/tests/test_menu.gd
@@ -0,0 +1,37 @@
+extends TestCase
+
+
+func _menu() -> Menu:
+	I18n.install()
+	var menu := Menu.new()
+	tree.root.add_child(menu)
+	return menu
+
+
+func _free(menu: Menu) -> void:
+	tree.root.remove_child(menu)
+	menu.free()
+
+
+func test_the_buttons_say_what_the_player_chose() -> void:
+	var menu := _menu()
+	var chosen: Array = []
+	menu.play_chosen.connect(func(open: bool) -> void: chosen.append(["play", open]))
+	menu.join_chosen.connect(func(address: String) -> void: chosen.append(["join", address]))
+	menu.address_field.text = " 192.168.178.20:25000 "
+	menu.solo_button.pressed.emit()
+	menu.host_button.pressed.emit()
+	menu.join_button.pressed.emit()
+	menu.address_field.text_submitted.emit(menu.address_field.text)
+	check_eq(chosen, [["play", false], ["play", true], ["join", "192.168.178.20:25000"], ["join", "192.168.178.20:25000"]], "in order")
+	_free(menu)
+
+
+func test_the_name_and_the_status_line() -> void:
+	var menu := _menu()
+	menu.name_field.text = "  Ada  "
+	check_eq(menu.player_name(), "Ada", "without the spaces around it")
+	menu.show_status("Verbinde …")
+	check_eq(menu.status(), "Verbinde …", "the status is shown")
+	check_eq(menu.solo_button.text, tr("MENU_SOLO"), "the labels come from the texts")
+	_free(menu)
diff --git a/game/tests/test_menu.gd.uid b/game/tests/test_menu.gd.uid
new file mode 100644
index 0000000..f64ffb9
--- /dev/null
+++ b/game/tests/test_menu.gd.uid
@@ -0,0 +1 @@
+uid://dh6uogkq28wa4