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Envy Mask (zs_envymask) is the third chapter of Zombie Scenario: Season 4 in Counter-Strike Online.


This is the story of Red Lizard Jim to discover and reveal the true color of the client.


Pursuit the mystery client and investigate on the secret super soldier program. Defeat the Dual Sword Wielder Neid and Heavy Artillery Zavist.


  • It would be wise if you follow the Display Checkpoint.
  • Press E key at devices which labeled [E], they will operate.
  • Destroy the red glowing obstacles to continue pursuit to checkpoints.

Official Description[]

Another cold winter... What's Gerard thinking... The mysterious client seems to be testing our patience... Mocking and making fun of us... Which brought us and our mentally and physically exhausted successive brothers here... But how do we leave now? How do we repay our brothers?...... The Red lizard Jim is not that weak, though. Think...... think... think...


  1. Gerrard leaves Jim and acts independently to find traces of David Black.
  2. Jim moves to a key facility to take revenge on an unidentified client who put the mercenary group in danger.
  3. At the core facility of the research complex, you will meet several experimental sites and a man who introduces himself as Dr. Rex, the culprit of the Lost City incident.
  4. Also, with the announcement that the Super Soldier Project was successful, the man who calls himself Dr. Rex disappears and the battle with the Super Soldier begins.
  5. CF. Neid and Zavist were originally human, but were reborn as perfect weapons by the Super Soldier program. It is not known what kind of experiment they went through, but they can often be seen competing and quarreling with each other as if they was trying to get one of themselves to recognize that who is stronger .

Release date[]

Envy Mask was released on:

  • South Korea: 28 January 2014.
  • Taiwan/Hong Kong: 11 February 2014.
  • Japan: 12 February 2014.
  • China: 13 February 2014.
  • Singapore/Malaysia: 11 September 2014.
  • Indonesia: 15 October 2014.
  • CSN:Z: 29 June 2015.
  • Vietnam: 24 November 2015.


Title Task Reward
[Complete the Envy Mask] Clear Envy Mask with 10 members from the same family. Superior Firepower 30 days
Honor mission
Title Description Task
Gentlemen, one felt that, rather than the two more powerful. Do not forget also the two of them, but the fact that we are not just as comrades. Note: only counted in room with 4 players and above, easy stage is not included. Defeat Neid and Zavist 100 times.


Gerrard msg
Zim msg
  1. Gerard: I have other task to complete, what should I do?
  2. Jim: We both have our own task to complete.
  3. Jim: It is more satisfying to face the mysterious client.
  4. Gerard: Yes, then we separate our ways from here.
  5. Jim: Do not get locked up the strange place again and call me for help.
  6. Gerard: You just take care of your own.
  7. Jim: The door is inaccessible by the looks of it, let’s look for another way!
  1. Jim: Don’t just stand there, find a way quick! There was something at the cliff, go check and see!
  2. Jim: Zombies are approaching! All hands on battle station!
  3. Jim: Something just went off? No idea what is it, be careful everyone!
Crash site
  1. Jim: Oh god! It’s the Frozen Terror!
  2. Jim: Clear the area!
Research lab
Anonymous (Dr
Doctorrex msg
  1. ???: Still managed to reach here in the end...
  2. Jim: We won’t leave until we see you defeated!
  3. ???: You won’t have a chance to stop my super soldier experiment.
  4. Jim: What an outdated villain quote, let’s see how powerful it is!
  5. Jim: It seems that it had traces of human memory.
  6. Jim: Check if there are survivors after those humans left.
  7. Rex: Well! I do not know you are such a timid little mouse.
  8. Jim: Who are you?
  9. Rex: Is this the first time you've met me? Your client, Dr. Rex.
  10. Rex: You're still alive until now... You really are a stubborn group of guys.
  11. Rex: You should've been killed by the zombies.
  12. Jim: How dare you! I’ll gather my brothers now to put an end to your evil planning brain!
  13. Rex: You wanna hear a story? You're going to die anyway.
  14. Rex: The Government had been experimenting human on super-soldier program now and I was placed in charge.
  15. Rex: I have worked so hard for the program, the government decided to end the program so suddenly with reasons like zombies infection.
  16. Rex: Idiots... It was just the beginning
  17. Jim: What is this?! ... You use human as guinea pigs!
  18. Rex: Do not worry, that was just data for messages.
  19. Rex: But because of their data and the completion of the study is a fact.
  20. Rex: To complete the super soldiers, even though we use human for experiment, but in return they reborn as superhuman beings, isn't that a good thing?
  21. Jim: This is inhumane ...! Doing something like that you think it would be all right?!
  22. Rex: Your brothers you brought here, aren't they my research sample?
  23. Rex: You are helping me to complete the experiment and you’re still blaming me for being inhumane?
  24. Jim: Nonsense, I dare you to stand there and wait, Rex! I will make you regret for what you've done!
  25. Jim: Hold your step! Unknown machines are operating!
  26. Jim: There is no way to past this. Find a way to stop the machine!
  27. Jim: I feel lighter in this room! The machine’s causing this?
  28. Jim: Let’s find the way to go up there!
  29. Jim: This door seems connect to the outside... Shoot harder!
  1. Jim: Something seems to have happened over there? Attention everyone!
  2. Laboratory ... Dr. ... hostage ... human experiments ... brainwashing ...
  3. ???: You must be envious to one another to be the strongest! Fight! Defeat the other super soldier!
  4. ???: Neid be the strongest, and you will be able to be my daughter.
  5. ???: Zavist be the strongest, then I’ll acknowledge you.
  6. You human ...I’ll trample you!
  7. Jim: Everyone fallback! Don’t die in vain!
  8. Jim: It was the guy we heard in beginning? We don’t really know him and the truth behind.
  9. Jim: Well, then let’s fight it!
  10. Jim: One down! One more to go!
Round 2
  1. Jim: Gerard, do you copy? What have you discovered?
  2. Gerard: What happened on your side, Jim?
  3. Jim: The client is Dr. Rex.
  4. Jim: Now this place resembles a military base... Eh? What’s that?
  5. Jim: Everyone, get ready for battle!
Joint skill
  1. Jim: Wait..what? The movement seems a bit unusual, beware!
  2. Jim: Ouch! That hurts! Everyone attack to divert it’s attention!
  3. Jim: Great! Now it’s a distance away!
  4. Jim: Divert attention failed! Everyone be careful!
Runaway skill
  1. Warning! One of them is gone!
  2. Attacks aren't ceasing! Don’t stick together!
  3. It seems to be staring at you? Lure them to separate from each other now!
Boss death
  1. Jim: Damn, they are really tough!
  2. Jim: Just a little more, Rex. I'll come to you!
  3. Gerard: Jim? I am reaching! Are you okay?
  4. Jim: Ah, I’m alright! Quick! Come join me to defeat these guys.



  • Envy Mask refers to Hannya (般若) mask which represents a jealous female demon or serpent.
  • This map replicates several parts of Half-Life maps. Some of which are from Blast Pit, Surface Tension and Lambda Core chapters.
  • The spinning tunnel and low-gravity section also take inspiration from the space-station section of Poke646: Vendetta, another Half-life mod.
  • This is the first Zombie Scenario map which introduces 2 main bosses. This is also the first time the players face female bosses.
  • This is the first Zombie Scenario map that introduces new Supply Boxes.
  • The first 2 rejuvenate chambers, players can see holograms of Jennifer (Uniform) and Natasha (Casual) in each chamber who are sitting inside and crying. Both of them will turn into Banshees and disappear if the player uses the E button, a loud scream also will be heard followed by a laugh.
  • The next 12 chambers, players can spot several captured female characters inside. They are: Jennifer (Uniform), Natasha (Casual), Yuri (Limited Edition), Alice (Limited Edition), Choi Ji Yoon (Limited Edition), Lucia, Blair, May, Erika, Michaela, Michaela (Limited Edition) and the Heroine (Kate).
  • Players will face Frozen Terror in Round 1 as a mini boss.
    • Occasionally, the gate could be opened without killing Frozen Terror. However, not killing it will be troublesome since he is able to even climb the ladder inside the facility.
    • There is another bug where sometimes, Frozen Terror will not appear, making the gate could not be opened. However, players still can access to the next area by climbing up each other (require 3 players to achieve).
  • The airplane at Frozen Terror's place resembles the one from Survivor.
  • There are holograms of Neid and Zavist and Spetsnaz operatives located inside the toxic corridor. There is also a huge hand found alongside some infected hands before proceeding to the chamber.
  • When the players reach at the end of the waterfall, there is a hologram of Gluttony where they must go through it to proceed to the next room.
  • In the promotional art, there is a PLA and SOZO operatives armed with M4A1 firing at Neid and Zavist, while GIGN operatives entering the battle.
  • In this map, the players can hear several hypnosis sounds like child chanting, soldiers marching, crying and screaming girls, and the sound of a drowning man.
  • Also in this map, beside the old Stalker Zombies which use Light Zombie's skin, there are new Stalker Zombies with Regular Zombie's skin. They share the same function with the old ones.
  • Sometimes, players could get stuck if they are standing where Neid and Zavist are infighting.
  • The background musics in this map shares the same ones from New Zombie Shelter and Zombie Darkness.
  • Some parts of this map are inspired from a Half-Life mod, Poke 646: Vendetta, released in 2006.