"The House of the Dead (abbreviated as HotD or HOD) is a video game franchise published by Sega and created by in-house designer Atsushi Seimiya of AM1.
As of 2009, there are five House of the Dead games originating in a first person rail shooter format available. The main series all have common elements of a pair of agents teaming up to take on hordes of biologically engineered undead. The games are divided into chapters, each of which culminates in a boss battle against usually massive, terrifying creatures. With the notable exception of one game, the bosses in the other four games are all named after the Major Arcana of occult tarot. The games are all controlled with a light gun in the arcades, but can be played with controllers or a mouse on consoles or the computer.
Gameplay elements differ among the different games in the series, with each having different characters, firearms, and types of enemies. In many of the games, there are branching paths (determined by one's actions) and unlockable bonuses, along with different endings based on one's performance.
Several spin-offs to the mainstream storyline have also been produced (including a virtual pinball game, an English tutorial and a typing tutorial), as well as two films. In addition, select enemy characters appearing in the first two games were adapted into fully-articulated action figures by Palisade Toys, which canceled the second toy line before street release due to limited returns from the first series.
The series is geared toward the main 4 Rail Shooter games."
Source: Wikipedia, "The_House_of_the_Dead_(series)", available under the CC-BY-SA License.