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The game begins in the realm of Chaos, a limbo world between Heaven and Earth. It is here that, without the use of secular weapons, the player must resort to his angelic powers to defend himself. These angelic powers were an innovative feature of the game, working similarly to the Force Powers of Jedi Knight, and adding an extra dimension to the gameplay. It was also one of the first games to feature a bullet time feature, slowing down time to allow the player to dodge bullets, and highlighting the game's then advanced animation system.

The game's weaponry mirrors those of many first-person shooters, featuring many "stock" weapons as found in other games; from the humble pistol to the rocket launcher, and ultimately, the railgun One of the player's powers is the ability to possess an enemy, and to have complete control over him. This allows access to various other weapons which could not be used via the player character. Requiem was the earliest first-person shooter game to utilise a bullet time effect (first seen in the coin-op vertical shooter Astro Blaster) whereby the player can slow time down for a brief period making it easier to avoid bullets and kill multiple enemies.

Like Half-Life, Requiem did away with explicit mission scenarios, and instead placed the player within a seamless interlinked world, without the discontinuity caused by long level-loads. The majority of the game is set in mid 21st century Earth, and thus many of the locations visited in game are stylised versions of everyday locales, including a bar, a hospital and a power plant, among others.