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SAS: Zombie Assault 4 > Guides > xxx's Guides
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How to get Black Keys, Boxes, Weapons, Armors
By xxx
Read this guide and your growth will be 10 times faster.
You have thrown away your Black Strongboxes without being able to open it due to lack of Black Keys.
You have spent a long time trying to get your Black weapons and armors.
These problems can be solved.
I hope you grow.
   
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xxx
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Languages: English
Posted
Updated
27 Jul, 2022 @ 3:55am
16 May, 2023 @ 7:00pm
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Guide Index
Overview
How to get Black Keys 
How to avoid wasting Black Keys 
How to get Black Strongboxes 
Appearance rate of black gun/armor (1/3) 
Appearance rate of black gun/armor (2/3) 
Appearance rate of black gun/armor (3/3) 
Unobtainable black armor 
How to get black gun/armor you want 
Related Guides 
Change logs 
Comments
How to get Black Keys
Here is how to get Black Key.


Nantonium Strongbox in Nightmare Mode
A Black Key is included in a Nantonium Strongbox obtained in Nightmare Mode with 5% chance.
Requires a character level of 35 or higher.
Probably, a Black Key is not included in a Nantonium Strongbox obtained outside of Nightmare Mode.

To get more Nantonium Strongbox, buy "High Roller" before starting the mission.
Its effects are as follows.
  • Increased Strongbox drop chance (self +3%, team +1%)
  • Strongbox quality increased 1 step
  • x3 chance for Thulium(Rank7)
  • x2 chance for Nantonium(Rank8)


Event Reward
You can get a Black Key as a reward for events.
Level 15 or higher is required to play events.

The top percentage of your points determines the probability of getting a Black Key.
  • Top 1%: 10.0%
  • Top 10%: 4.0%
  • Top 25%: 0.5%
  • Top 50%: 0.0%
  • Top 75%: 0.0%

There are three types of events.
  • Last Man Standing
  • Virus Samples
  • Apocalypse
Check out my guide How To Win Events on how to be in the top 1%.

It seems that whether Black Key or not is obtained is determined by some value of your account.
You can change the presence or absence of the Black Key by playing a mission, and by repeating it, you can finally get a Black Key.


Faction Armory
You can buy Black Keys in Faction Armory.
The required Credits and Favors are:
Item
Credits
Favors
1 x Black and Key
40000
2500
Black Key x3
40000
2500
Black Key
15000
1000


Real Money
Black Keys can be bought with real money.
  • Epic Pack (1x Black Key)
  • Nightmare Veteran's Pack (10x Black Keys)
  • Nightmare Veteran's Pack (10x Nantonium Strongboxes. Each Nantonium Strongbox has a 5% chance of a black key in addition to its contents)
  • 1x Black key
  • 5x Black key
How to avoid wasting Black Keys
This is a method to get back the black key when you check the inside of the black box and find the item you don't need.

It works for black strongboxes immediately after missions, Faction Armory black strongboxes, and event reward black strongboxes.

Note: This method does not work for black strongboxes on "Elite Inventory" screen.
Note: This method was confirmed in Version 2.0.1. It may not be possible to use this in the future.
Note: You must have at least one black key in advance.

Follow these steps.
  1. Get one (or more) black key in advance.
  2. Play any mission.
  3. Get one (or more) black strongbox.
  4. Complete the mission.
  5. Open that black strongbox.
  6. If you don't want the black item, kill sas4 app by typing Alt+F4 or clicking X(Close) button before doing anything else. That way, you can keep your save data just before opening the black strongbox.
  7. Start sas4 app.
  8. Select the character.
  9. Select "Open Later" or "Discard" for the black strongbox.
You can see that you have not lost the black key on "Elite Inventory" screen.
How to get Black Strongboxes
Here is how to get Black Strongbox.
Up to five can be held.


Enemies
If your player is level 25 or above, you can get Black Strongbox from enemies.
Black strongbox is 1-8 rank strong box with 0.5% chance of changing to it.
In other words, it changes to black at a rate of 1 in 200.

To get more Black Strongbox, buy "High Roller" before starting the mission.
Its effect has already been written above.


On The Floor
Shortly after you start a mission, you may find some Black Strongboxes on the floor of that map.
This is especially appropriate for Faction War missions. Because the location of Strongboxes will appear as a yellow dot on your radar immediately after you start the mission.
Other maps have secret places and you cannot instantly confirm the presence or absence of Strongboxes.

Repeat the following steps.
  1. Play any mission in faction war as single player
  2. Check your radar for the location of Strongboxes (yellow dots)
  3. If there is no Black Strongboxes, QUIT and go back to step 1
  4. Die when you pick up all Black Strongboxes (never QUIT to avoid losing it)
  5. Done


Event Reward
Every Saturday or Sunday event you will always get a Black Strongbox as a reward when you reach the top 1%.
You can check which day of the week on my guide Event Schedule.


Collection Rewards
You can get black strongbox by completing black collection.
Item
Black Strongbox
15 Black Assault Rifle
1
57 Black Weapons
5
57 Black Armor
5


Faction Armory
You can buy Black Strongbox in Faction Armory.
Item
Credits
Favors
1 x Black and Key
40000
2500


Real Money
Black Strongboxes can be bought with real money.
  • Epic Pack (1x Black Strongbox)
  • Nightmare Veteran's Pack (5x Black Strongboxes)
Appearance rate of black gun/armor (1/3)
You would like to get certain black guns and armor.
Which black items you can get depends on your character level.
By the way, your character must be at least level 25 to open the black box.

So I used characters of various levels and opened over 1000 black boxes for each.
The relationship between black item appearance rate(unit:%) and character level is shown in the following table.

No
Item
Category
Approx Drop lvl
Lvl 25
Lvl 26
Lvl 27
Lvl 30
Lvl 40
Lvl 50
Lvl 60
Lvl 70
Lvl 80
Lvl 90
Lvl 100
1
1887 Shockfield
Shotgun
100
0.8
0.8
0.8
0.3
0.7
1.2
2
CM 307
SMG
51
3.0
3.2
3.4
4.1
3
CM 330
SMG
24
1.2
4
CM 351 Sunflare
SMG
72
2.4
3.3
5
CM 401 Planet Stormer
AssaultRifle
31
3.0
3.6
3.3
4.3
6
CM 440 Titan
AssaultRifle
45
3.1
4.2
3.9
3.4
7
CM 451 Starburst
AssaultRifle
76
3.8
4.1
4.5
8
CM 505
LMG
68
4.2
9
CM 530 BabyCOM
LMG
84
0.7
1.5
3.0
2.0
2.2
2.9
2.3
10
CM 800 Jupiter
Sniper
80
1.9
1.8
2.9
4.0
3.0
2.7
2.5
11
CM Gigavolt
AssaultRifle
88
0.9
0.9
2.4
1.2
1.6
1.0
1.6
12
Dragonfly Boots
Boots
84
2.3
2.3
3.5
3.7
2.7
2.2
3.6
13
Dragonfly Gloves
Gloves
84
1.4
1.9
3.5
2.2
4.1
2.4
2.8
14
Dragonfly Helmet
Helmet
92
1.1
1.5
2.7
2.2
2.5
2.5
2.9
15
Dragonfly Pants
Pants
84
1.5
1.9
2.6
3.2
2.8
3.2
2.7
16
Dragonfly Vest
Vest
88
1.0
2.7
3.8
3.6
2.9
3.4
3.3
17
Gebirgskanone
RocketLauncher
68
2.5
4.2
18
Graphene Body Suit Bottom
Pants
100
1.3
1.5
2.0
0.9
2.0
1.3
19
Graphene Body Suit Top
Vest
100
0.9
2.0
2.0
2.1
2.4
1.9
20
Graphene Boots
Boots
92
1.4
1.1
2.1
1.1
1.0
1.2
21
Graphene Combat Hood
Helmet
96
2.3
2.2
2.2
2.1
2.2
1.9
22
Graphene Gloves
Gloves
100
0.9
1.8
2.3
1.8
1.5
1.5
23
Hard Thorn
AssaultRifle
80
3.3
3.0
5.2
5.3
6.1
5.5
5.3
24
Hardplate Boots
Boots
80
1.8
4.2
25
Hardplate Chest
Vest
84
1.6
2.5
2.2
2.6
2.9
26
Hardplate Gauntlets
Gloves
68
0.9
1.2
27
Hardplate Helm
Helmet
64
2.2
2.1
2.0
2.7
28
Hardplate Leg Protection
Pants
80
2.5
3.4
4.7
29
Heartburn
AssaultRifle
31
2.1
1.9
1.5
1.8
30
Heavy Trooper Vest
Vest
72
2.4
31
HIKS 3100
RocketLauncher
100
2.4
1.6
2.3
1.8
1.9
32
HIKS S300
Sniper
84
0.8
0.8
1.1
0.8
0.7
0.9
0.5
33
Hornet
Sniper
100
0.8
0.8
0.4
0.6
0.3
34
Hotspot
Laser
100
0.8
1.0
1.7
1.2
1.1
1.0
35
HVM 002
SMG
26
2.8
3.2
36
HVM 004
Shotgun
24
2.8
3.2
37
HVM 005 G-Class
AssaultRifle
24
2.9
38
HVM 008
LMG
39
3.1
2.7
2.2
3.5
39
HVM Carbon Fibre Boots
Boots
48
3.2
3.5
4.2
3.3
40
HVM Carbon Fibre Gloves
Gloves
36
2.9
3.2
3.9
3.9
Appearance rate of black gun/armor (2/3)
No
Item
Category
Approx Drop lvl
Lvl 25
Lvl 26
Lvl 27
Lvl 30
Lvl 40
Lvl 50
Lvl 60
Lvl 70
Lvl 80
Lvl 90
Lvl 100
41
HVM Carbon Fibre Helmet
Helmet
36
3.7
4.1
3.6
2.5
42
HVM Carbon Fibre Pants
Pants
54
2.9
2.5
3.6
2.9
3.5
43
HVM Carbon Fibre Vest
Vest
54
3.5
3.0
3.1
4.1
4.4
44
HVM Combat Boots
Boots
24
45
HVM Kevlar Gloves
Gloves
24
46
HVM Kevlar Helmet
Helmet
24
47
HVM Kevlar Pants
Pants
24
48
HVM Kevlar Vest
Vest
28
49
HVM MPG
RocketLauncher
54
1.0
0.5
0.9
0.8
50
Lone Star
RocketLauncher
36
1.3
1.9
2.7
1.8
51
Luftplatzen
RocketLauncher
76
3.3
3.3
52
Medusa Boots
Boots
72
2.6
3.3
53
Medusa Gloves
Gloves
92
2.7
3.5
4.0
3.3
3.6
3.2
54
Medusa Helmet
Helmet
88
2.5
2.8
4.7
3.9
3.8
4.9
4.9
55
Medusa Pants
Pants
92
3.3
4.6
4.0
2.6
3.9
2.7
56
Medusa Vest
Vest
96
2.3
3.6
4.6
3.4
2.9
3.0
57
Mixmaster
AssaultRifle
100
1.9
2.6
5.4
3.9
4.2
4.2
4.0
58
Mustang
Pistol
88
0.9
0.9
1.8
1.8
1.5
1.7
1.9
59
Phantom
SMG
33
1.1
1.3
1.5
1.3
60
Poison Claw
Pistol
54
1.2
1.6
1.2
61
Proposition
LMG
100
1.7
1.3
2.7
1.1
1.7
62
R1 Interceptor Helm
Helmet
72
2.7
3.0
63
R4 Guardian Vest
Vest
80
2.7
3.8
64
R6 Flamejuggler Gloves
Gloves
72
2.0
65
R7 Guardian Pants
Pants
76
2.5
2.9
66
R8 Huntsman Boots
Boots
64
2.9
3.1
2.1
3.0
67
Raptor
AssaultRifle
36
1.1
1.0
1.0
0.9
68
RIA 20 DSC
AssaultRifle
26
2.9
2.4
2.2
69
RIA 20 Para
AssaultRifle
28
3.6
2.7
3.9
70
RIA 20 Striker
AssaultRifle
39
1.6
1.6
1.6
1.7
71
RIA 30 Strikeforce
Shotgun
57
1.3
0.8
72
RIA 40
LMG
64
4.7
73
RIA 45 Para
LMG
51
1.9
1.1
2.2
2.2
74
RIA 50
Sniper
31
2.9
4.4
4.3
3.5
75
RIA 7
SMG
26
3.2
3.0
2.2
76
RIA T40
LMG
76
2.1
2.4
77
RIA T7
SMG
28
1.9
1.8
1.9
1.3
78
Ronson 45
Pistol
72
3.1
2.5
79
Ronson 50
SMG
68
2.1
1.8
80
Ronson 55
SMG
100
3.8
5.0
4.9
5.8
5.2
3.9
Appearance rate of black gun/armor (3/3)
No
Item
Category
Approx Drop lvl
Lvl 25
Lvl 26
Lvl 27
Lvl 30
Lvl 40
Lvl 50
Lvl 60
Lvl 70
Lvl 80
Lvl 90
Lvl 100
81
Ronson 65-a
AssaultRifle
51
3.0
2.5
3.4
2.8
82
Ronson 70
AssaultRifle
68
2.1
2.1
83
Ronson LBM
LMG
61
3.6
4.1
84
Ronson WP Flamethrower
FlameThrower
100
3.1
5.1
5.9
5.7
5.3
3.9
85
Rubicon Power Assist
Vest
84
0.3
1.6
1.8
1.6
1.7
1.9
1.2
86
Shotlite Hummingbird G1
Gloves
39
1.1
1.1
1.3
1.7
87
Shotlite Hummingbird H1
Helmet
36
1.2
1.9
1.6
0.5
88
Shotlite Hummingbird P1
Pants
39
1.5
0.8
1.9
1.0
89
Shotlite Hummingbird V1
Vest
42
1.3
1.3
1.2
1.7
90
Shotlite Starwalk Boots
Boots
39
1.2
1.8
1.3
0.8
91
Shotlite Tempest
Shotgun
80
2.0
3.3
4.8
5.3
3.2
4.0
3.2
92
Shredder
DiskThrower
80
1.4
2.4
1.8
2.7
2.3
2.0
2.5
93
Special Forces Boots
Boots
45
2.2
2.9
2.2
1.9
94
Special Forces Gloves
Gloves
48
2.4
3.2
2.5
1.6
95
Special Forces Helmet
Helmet
51
2.6
3.4
1.5
2.1
2.4
96
Special Forces Pants
Pants
48
2.2
1.6
2.4
1.6
97
Special Forces Vest
Vest
57
3.0
2.5
3.1
3.8
2.9
98
Stripper
Shotgun
80
1.7
1.0
2.4
2.9
1.8
99
Sub-light COM2
AssaultRifle
88
0.6
0.4
0.6
1.2
0.8
1.7
0.9
100
Supermarine
LMG
100
0.8
1.3
0.8
1.1
1.3
1.0
101
T-101 Feldhaubitz
RocketLauncher
72
2.7
3.3
102
T-102 Jagdfaust
RocketLauncher
88
1.3
1.7
1.9
2.0
2.8
1.9
2.2
103
Titan IDS 01
Gloves
100
1.0
1.3
1.7
2.1
1.5
0.8
104
Titan IRN HUD
Helmet
100
0.7
0.9
2.0
2.0
1.3
1.1
105
Titan MEM Sprint
Boots
100
1.5
1.3
1.3
1.3
2.3
1.2
106
Titan MEM Trooper
Pants
100
1.1
1.6
1.2
1.4
1.4
1.4
107
Titan Teslashock
Vest
100
1.9
1.3
1.6
1.1
1.3
108
Tombstone
LMG
54
1.1
0.9
1.1
109
Trailblazer
Pistol
84
0.7
0.7
1.0
0.7
1.1
1.1
0.6
110
Trooper Boots
Boots
33
2.5
2.7
2.1
111
Trooper Gloves
Gloves
33
2.9
2.3
1.2
112
Trooper Helmet
Helmet
31
2.3
1.9
113
Trooper Pants
Pants
36
3.1
3.0
1.9
2.1
114
Trooper Vest
Vest
36
2.5
1.5
2.7
2.5
Unobtainable black armor
However, you cannot get the following armor in version 2.0.1.
  • HVM Kevlar Helmet[Black] (Approx Drop lvl: 24)
  • HVM Kevlar Vest[Black] (Approx Drop lvl: 28)
  • HVM Kevlar Gloves[Black] (Approx Drop lvl: 24)
  • HVM Kevlar Pants[Black] (Approx Drop lvl: 24)
  • HVM Combat Boots[Black] (Approx Drop lvl: 24)

Ninja Kiwi, the developer, officially admitted that it was a bug.
Originally posted by Ryan (Ninja Kiwi Ltd):
Feb 4, 2023, 20:36 GMT+1

The Black CM 330 should be available from black strongboxes when a player is level 26.

Unfortunately, for the Black HVM Kevlar set, there looks like there is a bug that is preventing those from being dropped. We can look into it, but sadly we can't give you a timeline for a fix on that :(

I hope that helps!

Regards,
Ryan
Ninja Kiwi

So we don't get any black armor collection rewards. I hope it gets fixed soon.
How to get black gun/armor you want
To get the black gun/armor you want, first you have to match the level of your character to that item, then open many black boxes.

When the black item in the black box is determined depends on the situation.
  • If you are playing a mission, black items are determined when you pick up a black box.
  • In the case of the black box on the inventory screen, the black items change as the character's level changes.
  • In the case of the black box rewards for the top 1% of daily events on Saturday or Sunday, the black item is determined when the application is started.
  • In the case of the black box as black collection rewards, the black item is determined when the application is started.
  • In the case of the black box in the faction armory, the black item is determined when you join the faction.
If you have the ability to go back in time, you will be able to get and open a black strongbox for daily event and black collection rewards and faction armory many times, you will finally get the item you want.
Related Guides
https://cs2bus.com/sharedfiles/filedetails/?id=2900566750
See all gun details here.

https://cs2bus.com/sharedfiles/filedetails/?id=2901781733
See all armor details here.

https://cs2bus.com/sharedfiles/filedetails/?id=2844491929
Refer to the guide above on how to be in the top 1% at an event.

https://cs2bus.com/sharedfiles/filedetails/?id=2892246790
Refer to the guide above for event schedule.

https://cs2bus.com/sharedfiles/filedetails/?id=2814419750
Refer to the guide above for the required Favors types and schedule for displaying Faction items.

https://cs2bus.com/sharedfiles/filedetails/?id=2777580382
Refer to "Armory of Faction War" in the guide above for tips on getting Credits and Favors.

Change logs
  • July 28, 2022
    • Rewritten to limit Nantonium Strongbox, including Black Key, to be obtained only in Nightmare Mode.
  • August 6, 2022
    • Updated "How to avoid wasting Black Keys" chapter to show when it works and when it doesn't.
  • September 4, 2022
    • Added a way to get low-level items.
  • September 5, 2022
    • Added that items in black strongboxes on "Elite Inventory" screen change depending on character level.
  • September 28, 2022
  • October 25, 2022
    • Update on the level of black items obtained at character level
  • November 23, 2022
    • Add event schedule to related guides
  • November 28, 2022
    • Added about "On The Floor" to "How to get Black Strongboxes" chapter
  • November 29, 2022
    • Added that Nantonium Strongbox contained in Nightmare Veteran's Pack has a 5% chance of containing a black key
  • December 16, 2022
    • Added "Gun List", "Armor List" to "Related Guides" chapter
  • Jan 3, 2023
    • Added about how to kill sas4 app in detail to "How to avoid wasting Black Keys" chapter.
  • Jan 31, 2023
    • Added "CM 330" to unobtainable black guns
    • Added chapter "Black items obtained by Lvl 25"
    • Added chapter "Black items obtained by Lvl 100"
  • Feb 10, 2023
    • Fixed "CM 330" to obtainable only by lvl 26 character
    • Added chapter "Black items obtained by Lvl 26"
    • Added chapter "Black items obtained by Lvl 27"
  • Feb 24, 2023
    • Added relationship between appearance rate of black gun/armor and character level
  • May 17, 2023
    • Added about black collection rewards
49 Comments
< >
xxx  [author] 12 Jan, 2024 @ 7:54pm 
what do you mean?
ThrillHouse 12 Jan, 2024 @ 4:56pm 
Article should read "You've been operant conditioned, stop playing this game."
xxx  [author] 18 Feb, 2023 @ 7:45pm 
Thanks for your report.
The credibility of this guide has increased.
Lil Baby 18 Feb, 2023 @ 1:17pm 
Update: During a medical terminal faction war run there was a black box on the floor (not dropped from enemy)
xxx  [author] 12 Feb, 2023 @ 7:48pm 
I currently have no evidence that the black box was on the floor at the faction mission. The probability of a box turning black is 0.5%. That probability is not high.

When to open the black box depends on your objective. If you want stronger guns and armor, have a higher level character open the black box. If you want lower black items for the purpose of completing your black collection, have a lower level character open the black box.

https://cs2bus.com/sharedfiles/filedetails/?id=2833622609
If you want to get your character's level up quickly, refer to this guide.
- xp contracts: 2x XP
- prem gun: 1.5x XP
2 x 1.5 = 3 times
Lil Baby 12 Feb, 2023 @ 5:58pm 
also when do you think is the best level to start opening black boxes? I was thinking reaching 100 first but thats gonna take a while
Lil Baby 12 Feb, 2023 @ 12:42pm 
have you ever actually got a black strongbox on the floor during a faction war mission? the yellow dots on the HUD method. ive been doing it for a few hours and no luck so far
xxx  [author] 3 Jan, 2023 @ 7:41am 
Let me know when that works out for you:steamhappy:
Revalopod 3 Jan, 2023 @ 6:53am 
I will try next time I get a key 🙂
xxx  [author] 2 Jan, 2023 @ 7:58pm 
perhaps, "an indefinite amount of time as long as the next action you take is closing the game". i have never waited long. for example always less than 3 sec in my case.

it is working in current version 2.0.1

try it :D