diff --git a/Actors/Objects/Computer/UI/ControlComp.gd b/Actors/Objects/Computer/UI/ControlComp.gd
index 5b10710..8025f84 100644
--- a/Actors/Objects/Computer/UI/ControlComp.gd
+++ b/Actors/Objects/Computer/UI/ControlComp.gd
@@ -5,9 +5,9 @@ onready var scene = $"/root/scene" as GameInstance
 func _physics_process(_delta):
 	if not visible:
 		return
-	var speed_str = str(round(scene.world.map.current_ship_speed * 10000)) + " u/s"
+	var speed_str = "%.0f u/s" % (scene.world.map.current_ship_speed * 10000)
 	$Margin/Container/VelocityBox/HBoxContainer3/CurrentSpeed.text = speed_str
-	var dir_str = str(round(rad2deg(scene.world.map.current_ship_direction))) + " deg"
+	var dir_str = "%.0f deg" % rad2deg(scene.world.map.current_ship_direction)
 	$Margin/Container/VelocityBox/HBoxContainer2/CurrentDirection.text = dir_str
 	var current_position_str = Coordinates.as_string(scene.world.map.current_ship_position + scene.world.map.current_ship_subpos, true)
 	$Margin/Container/VelocityBox/HBoxContainer4/CurrentPosition.text = current_position_str
diff --git a/Actors/Objects/Computer/UI/EnergyComp.gd b/Actors/Objects/Computer/UI/EnergyComp.gd
index dd3111c..86e0a5e 100644
--- a/Actors/Objects/Computer/UI/EnergyComp.gd
+++ b/Actors/Objects/Computer/UI/EnergyComp.gd
@@ -15,8 +15,8 @@ func _physics_process(_delta):
 			total_sink += network.total_usage
 			total_source += network.total_source
 			total_alerts += network.unpowered
-	$Margin/Container/EnergyBox/CurrentSource/Value.text = str(round(total_source)) + " kW"
-	$Margin/Container/EnergyBox/CurrentSink/Value.text = str(round(total_sink)) + " kW"
+	$Margin/Container/EnergyBox/CurrentSource/Value.text = "%.0f kW" % total_source
+	$Margin/Container/EnergyBox/CurrentSink/Value.text = "%.0f kW" % total_sink
 	$Margin/Container/EnergyBox/CurrentAlerts/Value.text = str(total_alerts)
 
 func _map_button_pressed():
diff --git a/Actors/Objects/PowerStorage/UI/PowerUI.gd b/Actors/Objects/PowerStorage/UI/PowerUI.gd
index ac04a64..6777284 100644
--- a/Actors/Objects/PowerStorage/UI/PowerUI.gd
+++ b/Actors/Objects/PowerStorage/UI/PowerUI.gd
@@ -2,8 +2,8 @@ extends Control
 
 onready var scene = $"/root/scene" as GameInstance
 
-func set_current_charge(val):
-	$Container/CurrentBox/HBoxContainer/CurrentChargeLabel.text = "(" + str(round(val/10)/100) + "MJ)"
+func set_current_charge(val: float):
+	$Container/CurrentBox/HBoxContainer/CurrentChargeLabel.text = "(%.2fMJ)" % (val / 1000.0)
 	$Container/CurrentBox/ProgressBar.value = val
 
 func set_max_charge(val: float):
diff --git a/Classes/Coordinates.gd b/Classes/Coordinates.gd
index 9206c0e..1a88805 100644
--- a/Classes/Coordinates.gd
+++ b/Classes/Coordinates.gd
@@ -9,9 +9,7 @@ static func as_string(coord: Vector2, include_subcoord: bool = false) -> String:
 	else:
 		sector_name += str(int(y))
 	if include_subcoord:
-		var x_sub = floor((coord.x - x) * 100)
-		var y_sub = floor((coord.y - y) * 100)
-		sector_name += "." + str(int(x_sub)).pad_zeros(2) + "/" + str(int(y_sub)).pad_zeros(2)
+		sector_name += ".%02d/%02d" % [(coord.x - x) * 100, (coord.y - y) * 100]
 	return sector_name
 
 static func to_letter(num: int) -> String:
diff --git a/Scenes/Game.gd b/Scenes/Game.gd
index 5ba6bf2..4e9a110 100644
--- a/Scenes/Game.gd
+++ b/Scenes/Game.gd
@@ -30,7 +30,7 @@ master func send_map() -> void:
 	var id = get_tree().get_rpc_sender_id()
 	var map_data = world.map.serialize()
 	var systems_data = systems.serialize()
-	print("sending map data to ", id)
+	print("sending map data to %d" % id)
 	rpc_id(id, "receive_data", {
 		"map": map_data,
 		"systems": systems_data
@@ -44,7 +44,7 @@ puppet func receive_data(data: Dictionary) -> void:
 
 master func ready_to_spawn() -> void:
 	var id = get_tree().get_rpc_sender_id()
-	print(id, " is ready to spawn players")
+	print("%d is ready to spawn players" % id)
 	
 	# Tell him everyone to spawn
 	var players = $world/players.get_children()
diff --git a/Scenes/Global/Multiplayer.gd b/Scenes/Global/Multiplayer.gd
index 7fd336c..1691270 100644
--- a/Scenes/Global/Multiplayer.gd
+++ b/Scenes/Global/Multiplayer.gd
@@ -54,7 +54,7 @@ func punch_nat():
 		yield(get_tree().create_timer(.3), "timeout")
 		if socketUDP.get_available_packet_count() < 1:
 			failed += 1
-			print("no reply (attempt #", failed, ")")
+			print("no reply (attempt #%d)" % failed)
 			continue
 		port = socketUDP.get_var(false)
 		print("Received ", port)
@@ -66,7 +66,7 @@ func discover_upnp():
 	upnp.discover(2000, 2, "InternetGatewayDevice")
 	return upnp.add_port_mapping(SERVER_PORT)
 
-func host():
+func host(map_name: String = "odyssey"):
 	scene_manager.enter_loader()
 	scene_manager.loading_text = "Starting server"
 	
@@ -81,9 +81,9 @@ func host():
 		push_warning("UPNP magicks fail, punching NAT in the face")
 		yield(punch_nat(), "completed")
 	
-	server_name = player_name + "'s server"
+	server_name = "%s's server" % player_name
 	player_info[1] = { "name": player_name }
-	round_info = { "map": "odyssey" }
+	round_info = { "map": map_name }
 
 	bind_events()
 	var peer = NetworkedMultiplayerENet.new()
@@ -103,7 +103,7 @@ func host():
 	scene_manager.loading_text = null
 
 	scene_manager.load_scene("res://Scenes/Game.tscn", [
-		"res://Scenes/Maps/odyssey.tscn"
+		"res://Scenes/Maps/%s.tscn" % map_name
 	])
 	
 	# Add to master server after hosting
@@ -124,7 +124,7 @@ func join(server):
 	
 	peer.create_client(addr, SERVER_PORT)
 	get_tree().network_peer = peer
-	print("Connecting to ", addr)
+	print("Connecting to %s" % addr)
 
 func leave():
 	var peer = get_tree().network_peer
@@ -145,7 +145,7 @@ func _player_connected(id):
 		rpc_id(id, "_handshake", { "round": round_info, "players": player_info })
 
 func _player_disconnected(id):
-	print(player_info[id].name, " (", id, ") disconnected")
+	print("%s (%d) disconnected" % [player_info[id].name, id])
 	player_info.erase(id)
 
 func _connected_ok():
@@ -162,7 +162,7 @@ func _connected_fail():
 remote func register_player(username: String):
 	var id = get_tree().get_rpc_sender_id()
 	player_info[id] = { name=username }
-	print(player_info[id].name, " (", id, ") connected")
+	print("%s (%d) connected" % [player_info[id].name, id])
 
 remote func _handshake(infos):
 	round_info = infos["round"]
@@ -172,9 +172,9 @@ func _ms_request(endpoint: String, data):
 	var http_request = HTTPRequest.new()
 	add_child(http_request)
 	http_request.connect("request_completed", self, "_ms_response", [endpoint])
-	print_debug("Telling ms to " + endpoint)
+	print_debug("Telling ms to %s" % endpoint)
 	var error = http_request.request(
-		"https://" + MASTER_SERVER_ADDR + "/" + endpoint,
+		"https://%s/%s" % [MASTER_SERVER_ADDR, endpoint],
 		["Content-Type: application/json"],
 		true, HTTPClient.METHOD_POST, JSON.print(data))
 	if error != OK:
@@ -185,7 +185,7 @@ func ms_get_entries():
 	add_child(http_request)
 	http_request.connect("request_completed", self, "_ms_response", ["list_games"])
 	var error = http_request.request(
-		"https://" + MASTER_SERVER_ADDR + "/" + MS_GAME_CODE,
+		"https://%s/%s" % [MASTER_SERVER_ADDR, MS_GAME_CODE],
 		["Content-Type: application/json"],
 		true, HTTPClient.METHOD_GET)
 	if error != OK:
@@ -222,9 +222,9 @@ func _process(delta):
 		time_left = 30
 
 func _ms_response(_result: int, response_code: int, _headers: PoolStringArray, body: PoolByteArray, action: String):
-	print_debug("MS said " + str(response_code))
+	print_debug("MS said %s" % response_code)
 	if response_code > 299:
-		push_error("ms action \"" + action + "\" returned error: " + str(response_code) + " - " + body.get_string_from_utf8())
+		push_error("ms action '%s' returned error: %s - %s" % [action, response_code, body.get_string_from_utf8()])
 		return
 	var json = JSON.parse(body.get_string_from_utf8())
 	match action:
diff --git a/Scenes/Global/SceneManager.gd b/Scenes/Global/SceneManager.gd
index 4babf9d..2cf8d32 100644
--- a/Scenes/Global/SceneManager.gd
+++ b/Scenes/Global/SceneManager.gd
@@ -46,4 +46,4 @@ func get_progress() -> String:
 	var current = 0
 	for path in queue.pending:
 		current += queue.get_progress(path)
-	return "Loading scene (" + str(round(current/count*100)) + "%)"
+	return "Loading scene (%.0f%%)" % (current/count*100)
diff --git a/Scenes/UI/SpaceMapInside.gd b/Scenes/UI/SpaceMapInside.gd
index 6b577f8..5ee1725 100644
--- a/Scenes/UI/SpaceMapInside.gd
+++ b/Scenes/UI/SpaceMapInside.gd
@@ -34,8 +34,8 @@ func _physics_process(delta):
 		radar_next_remaining = RADAR_EFFECT_DELAY
 	if not visible:
 		return
-	speed_text.text = str(round(scene.world.map.current_ship_speed * 10000)) + " u/s"
-	dir_text.text = str(round(rad2deg(scene.world.map.current_ship_direction))) + " deg"
+	speed_text.text = "%.0f u/s" % (scene.world.map.current_ship_speed * 10000)
+	dir_text.text = "%.0f deg" % rad2deg(scene.world.map.current_ship_direction)
 	update()
 
 func _draw():