Beat the Clock

Part of the Game Rules section of Coddy's Godot journey. Lesson 24 of 29.

The countdown does nothing at zero and keeps going to -1, -2. Add the rules:

When the time reaches 0, the player loses. Show Time's up! and stop the game.
When the player reaches the flag first, they win. Show You win! and stop the game.

Stop the game with get_tree().paused = true. The pause stops the clock, so the time stays where it ended. It also stops the player, so nobody wins after the time is up.

if time_left == 0:
	$HUD/Message.text = "Time's up!"
	get_tree().paused = true

Challenge

Easy

In _on_clock_timeout(), after the label line, check if time_left is 0. If so, show Time's up! on $HUD/Message and pause the game.
In _on_goal_body_entered(body), pause the game after You win!.

Try it yourself

extends Node2D

var time_left = 10

func _ready():
	$HUD/Time.text = "Time: %d" % time_left
	$Goal.body_entered.connect(_on_goal_body_entered)
	$Clock.timeout.connect(_on_clock_timeout)

func _on_goal_body_entered(body):
	if body.is_in_group("player"):
		$HUD/Message.text = "You win!"

func _on_clock_timeout():
	time_left -= 1
	$HUD/Time.text = "Time: %d" % time_left