Lifeline is an immersive text-based adventure game designed for Mac users that places players in a unique survival scenario. The narrative follows the journey of a character whose spaceship has crashed on an unknown planet, and players must guide them through a series of choices and challenges by interacting through text message conversations. The game emphasizes decision-making and problem-solving, creating a dynamic storytelling experience where each choice can lead to different outcomes.

The gameplay is characterized by its real-time nature, where players receive messages from the character at various intervals, simulating a sense of urgency and connection. Lifeline combines elements of role-playing and adventure genres, offering a compelling storyline that unfolds based on the player's actions. This engaging format encourages players to think critically and invest emotionally in the character's survival, making it a notable addition to the role-playing game category.