In Alter Ego, players navigate the life of an imaginary character, making decisions that influence their alter ego's development and experiences. The game employs a tree diagram structure where players select icons representing different life events, allowing them to explore various paths and outcomes.

The storyline of Alter Ego begins with the player’s character as an infant, progressing through life stages while facing a range of experiences that can lead to both humorous and serious consequences. The choices made can significantly impact the character's future, including potential premature death.

Alter Ego stands out with its unique approach to decision-making and life simulation, incorporating psychological elements that track player statistics, which affect future choices and outcomes, thus providing a personalized gameplay experience.