[ENDED] All aboard the DOOM bullet train! [lvl 3+][ends May 30th]

I apologize to all of you who struggled with the controls. It's not part of the puzzle. Here's what you need to know. Use:

• WASD to move+strafe;
• arrow keys/mouse to move+turn;
• E to “use” (open doors, etc.);
• SPACE/left click to fire;
• SHIFT (hold) to run;
• F / Alt-Enter (when in game) to switch to fullscreen;
• RETURN to select menu options;
• ESC to enter main menu/exit menu (ESC is captured by the browser, so it also exits fullscreen);

Hope this helps.

If mouse motion is erratic (seems to happen mostly on firefox), remember that DOOM was originally designed to be played without a mouse. So you're actually getting the more authentic experience...

Hints so far (you may want to reveal them one at a time):

Shooter class
1st hint - it's a real hint, even if it sounds like it isn't
2nd hint
3rd hint - the low resolution confused some people (didn't notice it, sorry! - thanks go to Mithrenes for the heads up)
Guided DOOM meditation

Boomer class
more info (the video is a bit misleading but it's cool nonetheless)
lowercase/uppercase - you're looking at a single code, not two

Space Marine class
1st hint
2nd hint

I had such issues with firefox. I suggest you switch browsers if you can.
In any case, you can mostly make do with wasd+arrows for motion and aiming in Doom, you don't usually need to be so accurate, especially once you get a shotgun ;-)

Thanks!
I do suggest you read again the instructions... there's not much to it tbh.
I'll probably drop a hint tommorow it these prove too obscure to follow.

nudge nudge

Wow! thanks for that!

IMO there's no such thing as a dumb question.
And yes, the link is actually the puzzle(s). I can only give you my word that it's not a threat. It hosts a WebAssembly port of DOOM and it makes legitimate use of API calls that are often used for fingerprinting your browser by bad actors. No way around it actually.
Any chance you can access it via the TOR browser? it would be slower to load I guess, but should run just fine under the default security settings. Sorry.

Just saw your edit: It's my birthday and you made me feel young at 54. Thanks!

I compared this really quick to Chocolate Doom with DOOM1.WAD and I think I see the code when I RTFM, but it's partially obscured, even after the thing blocking it jumps to the left. If that makes no sense to you or especially to the OP, then I am on the wrong track for this train. Waiting until tomorrow for a hint.....

Thanks!
"Vintage" - gonna use that! Thanks again!

Cool!
I have two words for you: Lowercase/Uppercase.

Ok, I've found the boomer ticket, but looks like the ticket inspector doesn't let me get in

Nah, not an idiot, just maybe too eager :-)