LowLevelFatalError [File:Unknown] [Line: 249] 

Result failed 

 at D:/Build/++UE4/Sync/Engine/Source/Runtime/Windows/D3D11RHI/Private/D3D11Viewport.cpp:368 

 with error DXGI_ERROR_INVALID_CALL

These are my system specs:

http://speccy.piriform.com/results/sCSu0oN0IoDCZFtckDepKpp

First, in Building 2, I was able to move through some steel drums and a crate in the room on the right-hand side of the building near the sludge pool. OK, whatever, it's a minor graphical glitch in an out-of-the-way part of the building, so no biggie.

Then I was able to use the ladder for the walkway around the sludge pool to actually get on top of the walkway, surprisingly. I got back down to the floor surface, things seemed to go like normal again.

Then once I got card 8, I went back to the beginning area to open up that storehouse and build up my ammo reserves. There, I started noticing that as I was killing guards around the storehouse with the sniper rifle, they weren't always doing the "!" thing as they died. Even weirder, sometimes they'd do it *after* they died, once even when there was just a bloodstain on the ground. The alert music continued while I went back into the storehouse, then came back out, and didn't revert to the normal music until I killed another guard. Weird, things are seeming gradually glitchier as time goes on, but it's still generally going OK.

Then I got to the supercomputer room, entered the code to Steel Gear, that door opened up, cool. While I was in there, I wanted to use the console, so I tried hitting the "0" key; nothing happened. Tried several times, still nothing. OK, whatever, I didn't really have  a pressing need to use the console. So I went ahead and destroyed Steel Gear, the countdown started, I headed into the room with the Big Boss in it, but for some reason while the cutscene was playing, I was idly pushing keys on the keyboard waiting for the cutscene to end, when I noticed the sound effects for firing the sniper rifle, and opening/closing the door. As if I was actually moving the character around, though I couldn't see what exactly it was doing since the cutscene was still going. Then once the cutscene ended, the game window went completely black, though the music and sound effects continued just as if I was playing the game (including the sfx being timed with keypresses), but I just couldn't see anything, it was completely black. So I had to quit the game at that point.

Sorry for the wall of text, but I really have no idea what went wrong this time. Maybe some kind of working memory corruption or something? I don't know what could cause the game to get gradually glitchier like that. If you need more info, please let me know and I'll add whatever I can to help you figure this out.

-I put on the Uniform, went inside the front door of Building 2, then once inside I took off the Uniform and went back outside through the same door (by accident), so when I tried to go back in, I got the "Uniform personnel only" message... but it remained on the screen for almost the entire rest of the game, which naturally blocked my view a bit; new messages would overlay it, but it would still remain when those messages went away; it even persisted after (but not during) cutscenes too, IIRC; it's not game-breaking, IMO, but definitely not supposed to happen

Idea:

-in windowed mode, I accidentally resized the bottom edge of the window down so that it goes behind the taskbar (I have it along the bottom of my screen), and I was subsequently unable to grab the bottom edge of the window to resize it back to within the clickable screen borders; I'd imagine there's several ways of dealing with this, but if it were up to me, I'd prefer to have some kind of title bar that would allow you to drag the entire window around the screen; that would probably help with any kind of resizing awkwardness, at least allowing you to make sure the window borders are visible to drag with

Thanks for your time!

-seems like jumping can be used to do things you're not supposed to do, specifically, inside Building 2 close to the front entrance, there's a barrier just to the right. I was able to jump on the barrels/whatever next to the barrier, then OVER the barrier to the corridor on the right, thus basically bypassing the bulldozer boss. I'd imagine this could happen elsewhere in the game, though I haven't run around trying to do so.

-looking forward to that save functionality; it usually takes me 3-4 hours to get through this game since brain no work well, so I tend to have to break up my play time to deal with IRL stuff; if I need to go somewhere I'll just put the computer on hibernate so I can return to my place in the game, but I probably shouldn't have to do that; tl;dr: save functionality would definitely help folks that can only play for shorter time periods per sitting.

-were the end credits not meant to be read? 'Cause they're pretty durn small! (or am I misremembering that...)

-like others have suggested, increasing kick speed/adding a stun effect to it would make it a more viable move, though with all the ammo you can collect, there's little risk to just going full COD-style murderhobo and clearing all the rooms you move through, so it kinda feels like kicking isn't so necessary; now, if you were thinking of tightly restricting ammo availability, then kicking would become pretty essential for saving that limited ammo; ...hmm, maybe that could be part of a higher difficulty level or something, though that would venture further away from the original game.

-while I know that this is a non-commercial/personal-use-only project, I still worry a bit about the music and sound effects - which sound exactly like in the original game - and I wonder if those might prompt a C&D complaint or similar; are those also part of the Epic Games store assets you mentioned (which would mitigate that concern, I think)?

Thanks for making this re-make, and I'm looking forward to future versions!

Edit: forgot to mention that it runs quite well on my computer; here's my specs:

Alienware M17R4

Intel Core i7-10870H @ 2.20 GHz

32 GB system RAM

2TB NVMe Samsung SSD

NVidia GeForce RTX 3080 Laptop GPU, 16GB GPU memory

Windows 10 Home

• Add a slight stun/stagger effect to the melee attack, it's what made the movie viable in the OG game. As it is here, there really isn't a point since you're pretty much guaranteed to take a hit if you try to melee.
• This might just be me, but I'd probably classify Stealth Camouflage as an Equipment item rather than a weapon, seeing as that's the case for the Solid games.
• I know you're working with a limited animation library and I know some animation packs can be pricey, but maybe swap out the current dash animation for something more so resembling the dive from MGSV. I interpret the moves' utility to be the same.
• Maybe apply some kind of graphical indication of a grenades arc before the player tosses it to avoid accidental death via grenade.
• I'd as well say that however much indication you can give the player as to the guard's situational awareness, the better, Something like their vision cone on the mini-map ala the Soliton radar or some way to tell if the player's footsteps can be heard at what distance I think would be a good idea.

That's all I really have for now. Aside from the general obvious stuff like further polish, optimization, and the save feature I know you're working towards. All I could really add at this point is; as a fanboy of MGS it would be more rewarding to have a plot more so resembling the MSX version rather than the NES port. I'm not sure if you're doing the latter to avoid legal trouble (which is understandable, although I think Konami have the rights to both plots), or for a personal preference. As far as providing the definitive edition of Metal Gear 1, I'd be nice to at least have the original version's plot more so represented. That goes for character designs to, although, again I understand the limitations of Unreal's asset library.

I'm still playing through the game and having fun so, keep it up! Thanks.