ONLY READ THIS IF YOU ARE HAVING ISSUE, OR YOU'RE STUCK
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Help:

If the game starts to lag (game stuttering, sound issues, etc), try typing "ent_fire global_panic-relay trigger" to trigger a relay I made which kills a few non-important entities around the map (made to be used in area 3 (area after specimen 3) and onwards). If the issue persists, typing "snd_restart" into the console will fix the problem.
If all else fails, simply restart the map and noclip back to where you was (remember to recollect any golden keys you may have found).



If you ever get stuck "out of bounds", noclip back into the map, hopefully back to where you are supposed to be. (If in doubt, noclip to the elevators and check the wall textures).



If you want to get rid of the fog, you can type "ent_fire global_fog turnoff" in the console and it'll disable the fog. Typing "turnon" instead of "turnoff" will obviously turn the fog back on.

If the specimen are too scary or too much of a threat to you (for some bizare reason), then it should be noted that they only follow a strict "patrol" route. It should be very easy to learn this route and adjust accordingly to avoid them (but where's the fun in knowing what they'll be doing?)

Tip: if you wanna get on the crates in the water area without jumping, crouching will make make the game do a little hop for you. I presume this was done to help players get out of the water easier.

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Guide:

Area 1: Just keep exploring until you find the elevator to proceed

Area 2: Keycard can be found in the lab area where Specimen 3 spawns.

Area 3: Going near the mysterious cat will make them talk. Do this for each area and a wall will open, revealing a bloody hallway. Opening the door at the end of this hallway will count towards unlocking the barrier. The bronze key can be found in the Merchant's area. Simply go through the area just like in the original game and you'll find it where the Merchant would usually spawn.

Area 4: This area is pretty linear. Keep Specimen 10 close and you'll be fine. The blue key is in the water area, which is located directly opposite the locked door. In the water area, turn on the water pump on the left side to where you first enter, and then it'll unlock the door to the rest of the section which will contain the key. After unlock the door with the blue key, explore the next section until you find a lever. This will unlock the barrier you would've saw while keeping specimen 10 close. Backtrack to this point and and continue to the elevator.

Area 5: If you haven't grabbed both golden keys, you'll have to go left. This should simply lead you in a circle, or to the "joke" ending. If you unlocked the true ending, simply go right and follow the path to the ending. The right path is pretty linear, but towards the end becomes very confusing. Keep exploring this area until you find a lever which unlocks a barrier.

Boss: Avoid the pillar attack, kill the zombies (I recommend leaving the poison zombie alive since only 1 can be alive at a time) and then hit the fireballs back at the boss. This will allow you to keep hitting the boss until he dies, or recovers and goes back into the air.


Golden Key spawn locations: Machine room in area 2, Toybox in Area 3, GL Labs in area 4, Water area in area 4.