Resident Evil: Revelations returns to the survival horror gameplay of earlier series installments, with returning elements such as a limited supply of ammunition, and more emphasis on exploration and puzzle solving. The game's camera keeps an over-the-shoulder view from behind the playable character. The player may move the protagonist while aiming a weapon, and has the option to switch between a first-person and third-person perspective. A new device, the Genesis, detects items hidden throughout the game's environments.
BSAA head Clive R. O'Brian sends out Jill Valentine and her new partner, Parker Luciani to search for Chris Redfield and hís new partner, Jessica Sherawat. They have reportedly gone missing and lost contact with HQ during their mission to investigate Veltro's possible reappearance. Jill and Parker are sent to search for them at their last known location, a cruise ship - the SS Queen Zenobia. During their search for Chris and Jessica they encounter several B.O.W.s on the ship infected with the T-Abyss virus. They finally enter a room where they believe Chris is being held, realising too late that it was all a trap. Chris and Jessica, meanwhile, find a base of operations for Veltro; the Valkoinen Mökki airstrip in the mountains. Being informed by O'Brian that Jill and Parker are missing in the Mediterranean, they are redeployed to investigate their whereabouts. Awakening in separate locked rooms of the SS Queen Zenobia, Jill and Parker manage to escape and regroup. They later encounter FBC agent Raymond Vester, whose life Parker had saved during the Terragrigia Panic. They also witness a video transmission of a masked man claiming to be part of Veltro who threatens to infect approximately one fifth of the Earth's oceans with the t-Abyss virus, a marine virus derived from the deadly t-virus in retaliation to the FBC for their involvement in the destruction of Veltro's forces on Terragrigia.