A downloadable game for Windows

You are a tough as nails detective in the 1920s out to find clues or leads on a mystery of sort but alas end up in a castle full of purple horrors who bite, spit on you, call you names,  demonetize your videos .. the very worst things one can imagine
and on top of that  Chutulu keeps prank calling you ..

This game will make you go mad just by knowing it exist  .. or just make you bored and snort a lot .. either way, have fun!

Goodies: Devlog Textures

Update: added new version with minor fixes
Update2: found a rarely occurring movement bug, added a fixed version
Update3: extra fixes for win10 (and xp) compatibility
Update4: fix for frame skipping (Build 627)
Update5: fix for windowing (Build 628)
Update6: added trainer and cheats (created by Birds0And0Games and seifmagdi )
Update7: config fix - and included the editor (Build 631)
Update8: standalone Mod Menu (by Birds0And0Games and seifmagdi )

Check out the spiritual sequel with the improved version of the engine: Zortch!

Rated 4.2 out of 5 stars
(45 total ratings)
Authorsmutantleg, Birds, seifmagdi
GenreAction, Shooter
Tagscthulhu, Destruction, First-Person, FPS, Funny, Horror, Lovecraftian Horror, Low-poly, Singleplayer
Average sessionA few minutes
InputsKeyboard, Mouse
AccessibilityConfigurable controls


Nekkrobox_latest_v103_Build 631.zip 23 MB
NekkroBox Trainer.CT for CheatEngine by Birds0And0Games and seifmagdi (This is o
Nekkrobox_Modmenu.zip (standalone mod menu by Birds0And0Games and seifmagdi) 310 kB
Cheats.txt by Birds0And0Games 1 kB


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man this is great! i've just played zortch and this looks cool as well, your unique style makes your games worth to play! keep up the good work <


higher fov wouldve been nice i feel really nauseous after playing this


mutantleg check this out remember when you told me in one of your emails about those data.dat files being zip files with everything inside them? I took the chance and updated the cheats.txt file now it includes all test maps (found nothing new in LAB as you told me) as for Zortch there is alot to uncover even the unused weapons have a pickup that can't actually be picked up neat



I should probably include those weapons somehow - like so you could actually select them without cheats 馃 (thing is I coded myself into the corner with the weapon system so it's more difficult than it sounds)

(1 edit) (+3)

since when did I become an admin O_o

I love how I went from a simple guy who makes cheat engine cheats for LAB to this loool

(1 edit) (+2)

Hey mutantleg, me and Birds have finished the Mod Menu. Hopefully you can put it here soon too!

Preview video:

Download link (your anti-virus will most likely detect it as a virus, ignore the false flag.): https://mega.nz/file/8mhi0aYa#dZDZ2Q4NfP3ye3xxF9mH88YRfLEBK6jxwEQ7GzS5_m4


so far it only gave me this error (might be because I'm on win7?)

(1 edit) (+2)

Hi mutantleg,

Yeah you are right, sorry it was a small faulty coding lol. Try this:


Should hopefully work now.


works great! added it to the page 馃憤


Hi mutantleg,

Good to hear that the menu works now.

Some changes have been done to the mod menu today. Here is the new version:


Also a small correction: The mod menu is not a trainer. You might also want to recommend people to get the mod menu instead of the Cheat Engine trainer.


Approved xD


ok I updated it,  anyway I feel it's time to cut the middleman :
I added you both as project admins (you need to accept with the link I sent you first)


insane sneak peak of what's coming soon to all of your games mutantleg it will replace trainers... MOD MENUS!!!




this will make it a lot easier to add features as we can code in C/C++ instead of assembly in cheat engine which didn't quite make sense lol


looks impressive (might as well write your own games at this stage 馃檪
btw how do you guys feel about javascript?
recently I discovered I had a github account I forgot about and decided to dump some old (and on hold) projects on there, some of them might interest you: https://github.com/mutantleg?tab=repositories

(1 edit) (+1)

I am still learning C/C++ might as well do it once I finish my exams as for JavaScript yeah it's easy tbh and funnily enough I had stuff related to JavaScript in my computer exam today lol and as for making games I am not ready yet


well I'd say you seem ready skillwise at least
it's always a shock to new programmers when they see their first real project in the wild (e.g. in a job) and realise every project is a giant mess - it takes  time to get used to it and not to be afraid to make such a mess yourself 馃

(3 edits) (+1)

after having a break from my exams yes some stuff is interesting i will take a good look at it also LAB2 stuff!? dayum

edit: finally knew what was that weird blue thing I saw in your LAB2 test vids it was just LAB2 grenades lmao


tbh it was just going to be another remake - but I hate coding in js so much that it took forever to get anywhere (and yet for some bizarre reason I kept returning to it)


Got no time to make any simple games from scratch. I would rather use an all ready game engine such as Unity if I am planning on making a simple indie game.

Not really interested in JavaScript lol, only C/C++.


can't help but agree with you on the C/C++ part

btw have you guys tried or used Lua before for anything?


we did it and added spawn objects for this game (the first one of your games that adds spawn objects it's done by seifmagdi) enjoy causing havoc around this game :D

nekkrobox trainer:https://www.mediafire.com/file/1pzdn2jrs06mhvn/NekkroBox_Trainer.CT/file

nice! it seems to work correctly too! (alas there are not many objects to spawn in this game)
added to the page 馃憤


BUG FOUND!!! if you go to the options menu and go to keys after you reboot after changing all of your keys to something else they will reset to their defaults yet you can still use what you have changed last time

the screenshot will help basically last time i changed my keys I changed "Reload" to "R" and it has been reset to Q on the menu BUT I can still use "R" and "Q" isn't useable same goes for crouch it's not F and C it's CTRL and C

(1 edit)

are you sure you want me to fix  it? (it might break your trainer - also you are the first to have noticed it after 3 years)
I think I only fixed it for Zortch so far (nobody noticed it in ZortchTest)


UHHH NVM THEN XD I mean it's not that serious of a bug it's just a lil weird and off but I don't want to break my trainer xD


after thinking why not update it? seif will help with updating the trainer

should be ok now
also I dug up and got the editor to work (as you guys seemed to enjoy looking into test levels)

(1 edit) (+1)

holy shit what :O

edit: remove the cheat table until I release the new version that will adapt to the new version of this game

ok, it's hidden

mind if you tell me how to access some of this stuff? and I dont know how to use map editors yet so its kind of awkward xD (plz tell me how to access any other levels if there are any other than that one test level found one using the batch file)

(1 edit)

it's pretty simple: use F3 to load a map, WASD RF and mouse to navigate around and use the console command PLAY to test it out ingame (also there should be a readme with more keys)

ingame it's the same console command as Lab (MAP mapname) but I just noticed it's seems to be broken using this way.. I'll get back to you on that 馃
Edit:  works fine, I forgot that you need to start a new game for it to work


finally did it i am gonna do this quick i dont have time to write in comments

cheats.txt: https://www.mediafire.com/file/htyucy7qn9obv1k/Cheats.txt/file

nekkrobox trainer: https://www.mediafire.com/file/raixc803hqmytvk/NekkroBox_Trainer.CT/file

I added them 馃憤


don't forget seifmagdi who helped with some of this stuff xD

of course (added him too)


hey mutant so I was wondering mind if you send the files needed for debug mode over email if possible? just gimme your email address and I will send a confirmation email ok?

you mean like the c++ .pdb files?
(or if you mean ingame debug you only need to use DEBUG in the command line)
anyway it's:  mutantleg(at)gmail.com

(1 edit) (+1)

whaaaaaat DEBUG in command line??????? gonna test this out 

edit: back after trying this I didn't know this game had 2 debug modes! good one

(1 edit) (+1)

kinda late but i want this to be fixed my laptop can't run this game i tried to do it before but it just doesn't here are the specs if it will help it basically freezes once I start a new game if i pause it then i could regain control of the menu and maybe quit if you could do some sort of special fix for me i would be grateful please mutantleg i used to play this on my windows 7 PC

this is so strange that people still want to play this - I mean this was just a jam throwaway game 馃
I'm kind of embarrassed by it now 馃様

anyway I could only guess what went wrong: I added a new version (v103) - so far I tested on my trusted potato win10 laptop and seems to work fine .. of course it only has win10 home so who knows 馃

let me know if it still gives you trouble


thank you i will give you feedback


so uhhh one problem its a tiny problem tbh the ending has the same issue as the gameplay was before but having the menu screen just makes the ending play out like normal otherwise the game is ok to play i hope you fix the ending and thanks so much bro love you and your games :)

could you elaborate on this a bit (I guess we probably talked about it but I cannot seem to remember)

what goes wrong with the ending?

(1 edit) (+1)

remember when i told you that the gameplay freezes until i pause and regain control on the pause menu? its exactly just that but instead of it being the gameplay its the ending

I vaguely remember .. but I'm not sure what is going on - it supposed to pause if the window is not in focus and maybe that part is acting up 馃 (but it should not happen in fullscreen at all)

does the gameplay still freeze?
(also anything like this happening in Zortch?)

what engine was this coded in?!

it's a custom engine (written in c++  and uses these libs: opengl, openal, stb_image, miniz, pugixml)

(1 edit)

Cool game!

Cool vid!
and you actually took the time to defeat the spider too.. I greatly underestimated players

are there older versions available for this game?

no, sorry, but they were pretty much the same (only bugfixes were added)

(1 edit) (+1)

Played the first 10 mins or so, really fun but there was no gun sounds and it was very distracting. I could hear the reload sound, but firing the gun would make no noise. The monsters were also surprisingly quiet, they would make occasional gross noises but they felt kinda quiet (though that might just be caused by the lack of gun noises), making every gun fight feel kinda awkward and broken. Anyone else have the same issue?


yes it has been mentioned by others too  .. they are there just very quiet
(I just seem to have trouble with sounds in  all my games
and have not figured out why yet: for now sorry about the inconvenience)

Great and short game. definitely reminds me of cruelty squad.very good

(2 edits)

I enjoyed what you have here enough I'd honestly like to see it expanded into a full game.

It's a really solid old-school style FPS 



pretty neat but the sound design could use some work


Its so awesome XDDDDDD


Short, sweet, and very well-designed with plenty of humor.  Would definitely recommend.


It's very short and simple, but something about the atmosphere really pulled me in. I'd love to see a full game set in this world with this kind of atmosphere and gameplay.

quisiera que hubiera un segunda parte del juego.

termine el juego juego el jefe final fue un reto pero lo termine.

me gustar铆a que los archivos que los archivos del juegos estuvieran en una carpeta llamada Nekkrobox_Data.

aprop贸sito si me gusto en juego.

(1 edit)

glad you enjoyed it!

if you want to look at the game files: the data.dat is actually just a .zip file

(btw i relied on google translate to try to figure out what you mean: i'm not sure i fully understood the data part)

has pensado hacer una segunda parte de nekkrobox  el juego es interesante tiene un buena jugabilidad y tendr铆a mas jefes, mas enemigos pero se dejar铆an los mismos, con nuevos enemigos me refiero no se como un clon del protagonista un monstruo volador con  alas que disparare las bolas rojas, una versi贸n de los ojos morados pero que dispare laser de color rosa no se.

si lo piensas por favor me escribes  :)

well I'm working on a game with the same engine which puts Nekkrobox to shame when it comes to features and gun and monster count .. not exactly a sequel but a game in the same spirit (still horror just a sci-fi setting this time)
but it will be a long time until it gets released

here are a few teaser screenshots:

sebe que estar谩 bueno gracia 


hola mutantleg solo quer铆a preguntar que aplicaci贸n  o sistema usaste para hacer el juego de nekkrobox.

visual studio c++  with libs: opengl for 3D, openal for sound, also: pugixml, stb_image, miniz

Good game.

is there any way to run this game without admin rights, some games on this website do, I really want to play this game but the owner of this laptop doesn't give me admin rights


I guess not yet (I was not aware this was an issue until now)

if you give some examples of games here that you can run without admin rights I'll look into how they did it

The 5th beta for Ravenfield doesn't require it, your game "lab" doesn't also require it, I really like the look of the game and its gameplay looks interesting

(1 edit) (+1)

Thank you, i've been looking into it and so far it's caused by a sort of restriction of where programs can save files, hopefully that's all to it (still it might take a while to get it work)

(the remake (https://mutantleg.itch.io/lab-v30) or the original?)

I have trouble reproducing it for some reason (tried standard user in Win10 and worked, tried on another pc with Win7 both standard and guest user and neither had trouble starting)
so I need a bit more info about your setup: just simple things like what version of windows you are using, if there any antivirus installed that might be the cause, is the itchi.io app is installed and has the same problems etc.

I'm pretty sure the original lab doesn't require admin rights, haven't checked out the remake though, I'm using windows 8.1, no antiviruses installed, I'll install the itch.io app later to see if it has the same problems, still thank you for your effort and feedback

(3 edits) (+1)

I dug out my old win8.1 tablet (maybe it wasn't wasted money after all :)

and managed to reproduce the problem with the guest user

The app seems to be the workaround: I had no trouble installing the app and starting it with that one; did it work on your end?

(also I hid the old versions because the app was preferring them for some reason)

Very nice, you really got something going on with this engine of yours.


this was pretty fun to speedrun. might wanna fix the glitch that makes you go faster when walking/running diagonally though.


I'm not sure I should.. after all it's  tradition in FPS to run faster diagonally (or at least it used to be)

what kind of engine did you use for this game?


it's a custom engine (c++ and opengl)

Hi! I am contacting creators/developers on behalf of a graduate researcher studying how Lovecraft is represented in games. If you have time to complete a 10-minute survey about Nekkrobox, please send a message to: masonsmith [at] tamu [dot] edu.



Why you don't propose to pay for your game, it seems to be really nice!

this was a very fun game however i had to take my headphones off lol. i like the feel of the gameplay, it reminds me a lot of quake. the open world level design is also very cool. but there is one problem that is hard to put to words, polish. i cant really describe it but a lot of things just feel thrown together. for example the face being poorly cropped, or there not being a melee. however, once you polish the game up it will be fantastic

Man that's ironic, a whole lot of polish went into it (you should have seen the old versions) 
but alas  shipping is cutting

Great game, wished that unity games we're like these games

Nice vid! Indeed, unity is a two edged sword

This was actually interesting.  A quick little shoot-em up game.  Some of the sound volumes were off like the sound of the pistol and enemies were extremely silent. However, after reading the comments it looks like that was intentional.  I like the little humor aspect of it.  If the developer(s) polish this up more and add more levels, it's a game I'd visit again.  

Attached is my game play video.  It's the first game in the video. 

Cool playthru! 
Nah, i just suck at sound fx

This was so amazingly atmospheric!

It was really fun!


Cool playthrough! (btw yes it's a burp sound)

I'm hoping there not being a shotgun and the pistol sounding absolutely quiet was intentional to make the game 'bad on purpose' or the sort? Why is the pistol sound design so....weak? It hurts.

Actually I like the pistol sound so dunno.. but the goal was to make a bad game so i guess it's fitting then

(also the R for jump, F to crouch is because I used to play Duke3D a lot and I found those keys were most convenient when moving with WASD .. I mean yea R is the first letter of reload and so on but my fingers were having none of it)

Hmm, I just always changed the controls back-then when playing those games, though Duke3D wise I probably played it more on the N64 than on any other platform lol

That was fun!  I especially love the ominous atmosphere and depiction of Lovecraftian monsters.  You also did an excellent job on the graphics engine, too.  I'm impressed:)

(1 edit)

Thank you!
(also your game is waaay cooler than this one :)

(1 edit)

Wow!  Thanks for the compliments:)   I don't know about  "cooler", but I'm flattered, nonetheless.:)

However,  you've created your own 3D  engine for the job; that takes way more talent than I have!:)

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