A Todo Vapor! (Full Steam!) is a party game which is played while engaging in other activities. Each player draws a character card that is either a suspect or an investigator. The suspects have a list of activities that they have to fulfill, while each investigator has two special abilities that they can each use once during the game. Whenever an investigator believes that a suspect is doing an activity from their list, they can call out the suspect. If correct, the suspect may no longer use that activity to score. If wrong, the investigator loses one of their special abilities. The suspects win if any of them manages to execute three of their activities. The investigators win if none of the suspects has enough undetected activities left.