Hidden Agenda is an action-adventure game played from a third-person perspective. The player takes control of homicide detective Becky Marnie and district attorney Felicity Graves, both of whom are involved in the case of a serial killer known as The Trapper. The game features quick time events that determine the outcome of the story, including a character's death or survival.
With the PlayLink feature, others may join the game to vote for a specific decision to be made, using their Android or iOS smartphones. One player will at some point receive a secret objective, or Hidden Agenda, which is intended to create conflict between the players as they try to prevent it from happening.