Set in Pripyat, Ukraine in 1996, the player assumes control of then Lieutenant John Price and is assisted by their superior Captain MacMillan.

It was designed by Mohammad Alavi initially in secret due to the difficulty of explaining its intricacies to the artificial intelligence (AI) programmer.

"All Ghillied Up" was praised for its atmosphere, pacing, and freedom of choice, and has since been considered by critics to be one of the greatest levels in video game history.

The player proceeds to another field where they encounter a platoon with BMP-2 infantry fighting vehicles advancing across it, and hide from the enemies in the foliage using their ghillie suits in prone.

[1][4] At the time of its release, the level was the first in the series where NPCs could react differently based on the players' behavior like those seen in stealth video games.

[7] The mission ends with MacMillan and Price setting up in the abandoned Polissya hotel to prepare for an assassination of Imran Zakhaev, leader of the Ultranationalists, who has arranged a black market weapons deal with radioactive fuel rods from the Chernobyl plant.

[1][2][4] The next mission, "One Shot, One Kill", concludes with a failed assassination attempt, a hurried retreat, and a final stand-off in front of the Pripyat amusement park ferris wheel.

[5] This code was created in secret by Alavi due to the difficulty of explaining its intricacies to the artificial intelligence (AI) programmer, who was already swamped with work.

[5] The lead designer, Steve Fukuda, played the first minute ten different ways and had fun each time, which Alavi considered to be a success.

[16][11][13][10] Jeff Gerstmann writing for GameSpot recounted the section as a breathtaking moment, while McCaffrey commended the segment for its high tension.

[6] PC Gamer said that "All Ghillied Up" was one of the strongest levels in Modern Warfare, and that it "demonstrates the real craft of a linear story-driven first-person shooter".

[19] IGN called the level one of the best stealth missions in games,[20] while Digital Trends and NME described it as among the greatest in any first-person shooter.

[28] GamesRadar+'s Leon Hurley wrote that the mission is "a masterpiece of tension and pacing", and that its recognizable setting and flow "make a level that's better than some entire games.

[32] Ars Technica said the level introduces parallels between Price and the game's main player character Soap MacTavish.