In 'Behind Closed Doors', players navigate the complex relationship between two step-siblings, Alex and Jamie, who have been raised together but remain virtually strangers. The game unfolds as Alex accidentally discovers Jamie in an unexpected situation. Utilizing choice-based interactions, players explore the themes of secrecy, trust, and identity, with the critical decisions shaping the characters' futures and their bond. As players confront various challenges, they must balance humor, vulnerability, and the taboo nature of their relationship, leading to multiple possible endings based on connections forged throughout the game.