Blood is a PC game developed by 3D Realms and Monolith Productions and distributed by GT Interactive. Development was underway at 3D Realms in parallel with a number of other well-known titles. Following the success of Duke Nukem 3D, development progress was made public starting in June 1996 with weekly updates on their website. It was originally scheduled for release in early 1997. On January 22, 1997, a press release announced that all rights had been sold to Monolith so that 3D Realms "could focus efforts on Shadow Warrior," another Build engine game slated for release the same year. Released on May 31, 1997, it utilized an enhanced version of the Build engine from Ken Silverman which featured the addition of voxels. The game falls in the first-person shooter category and has an arsenal of curious weapons, numerous enemies and liberal amounts of gore.
Cryptic Passage was published by Sunstorm Interactive and is the only officially authorized commercially available ten-level add-on episode for Blood that was not made by Monolith. It should be noted that Cryptic Passage was released before Monolith's own Plasma Pak expansion.
Quake is a first-person shooter video game that was released by id Software on June 22, 1996. It was the first game in the popular Quake series of video games.
The player takes the role of an unnamed soldier sent into a portal in order to stop an enemy code-named "Quake". Previously, the government had been experimenting with teleportation technology, and upon development of a working prototype called a "Slipgate", this enemy has compromised the human connection with their own teleportation system, using it to insert death squads into the 'human' dimension, supposedly in order to test the martial capabilities of humanity.
The sole surviving protagonist in Operation Counterstrike is the player, who must advance, starting each of the four episodes from a human held but overrun military base, before fighting through into other dimensions, traversing these via slipgate or their otherworld equivalent. Once passing through each slipgate, the player's main objective is to survive and locate the exit which will take him to the next level, not unlike that of id Software's previous hit, Doom.