*THIS REVIEW CONTAINS POSSIBLE SPOILERS -- YOU HAVE BEEN WARNED*

Clive Barker's Undying is a first-person shooter psychological horror video game. It was the last game developed by DreamWorks Interactive before becoming EA Los Angeles, and released in 2001 by EA Games. Noted horror author Clive Barker was consulted in shaping the game's plot and background story and also provided the voice of Ambrose, a character in the game.

Undying follows the adventures of 1920s Irish paranormal adventurer Patrick Galloway as he investigates the mysterious occult happenings at the estate of his friend Jeremiah Covenant.

The gameplay of Undying in general follows the precepts of the first-person shooter genre. The game simulates the main character's (Patrick Galloway's) point of view for the player, who uses a variety of weapons to defeat enemies within the game while making his or her way through a series of levels. As with most FPSs, Galloway has a certain amount of health, represented by a cross symbol and corresponding number at the bottom center-left of the screen. Each time the player is hurt by an enemy the health number is continually reduced until it reaches zero, at which point Galloway dies - an event which is usually marked by a third-person cut scene which shows his gruesome final moments. To prevent this, health can be replenished when low using health packs. Patrick's maximum health can also be permanently increased at certain points during the game.
In Undying the player is capable of using both conventional weapons and magical abilities simultaneously.

Another aspect of the gameplay of Undying - and one which makes it somewhat similar in terms of ambience to traditional role-playing video games - is that along with its set of offensive weapons, the player is able to use a wide range of magical spells. Spells consume a certain amount of Galloway's magical energy, or "Mana", which is represented by a flask icon and corresponding number on the bottom center-right of the screen. This energy slowly regenerates itself over time. Magical tatto pickups called "Arcane Whorls" permanently increase mana regeneration rate, while amulets called "Mana Wells" increase maximum mana by 10 up to 200. Once the player acquires a spell, it may be boosted in power each time the gamer finds an "Amplifier Stone", which are purple glowing crystals scattered throughout levels of the game. The player can simultaneously wield weapons in his left hand and cast magical spells with his right; the power of both the weapons and the spells increase accordingly as the game progresses.

Also, as is common with first-person shooters, combat is interspersed with simple puzzle-solving elements which usually involve overcoming an obstacle (such as a locked door) which impedes the player's progress through the game. Along with the usual "find the key" solution, the player is also often required to engage in conversation with non-player characters, or use a certain spell (usually the "Scrye" spell) in order to find out how to proceed