The Use of Life allows players to assume the role of the protagonist, whose name and appearance can be customized. Set in a fictional world, the protagonist faces various challenges and decisions throughout their journey. These decisions impact the character's relationships with other characters and their overall outlook on life. The mechanics include a system of "attachments," which represent the character's emotional bonds with other characters and their personal beliefs. These attachments can change depending on the player's choices, ultimately impacting the ending.