Quake II had two console ports back in 1999: one for PSX (HammerHead) and another for N64 (Raster). While the former tried to stay close to the source material (though still added in two new enemies), the latter went its own way via a mostly original campaign of 19 continuous levels coupled with a dark ambient soundtrack by Aubrey Hodges.
The 2023 remaster goes the extra mile and brings the N64 campaign to other platforms for the first time, even to the point of mimicking its slightly altered physics. To not spoil things any further, it is left to the player to discover what is in there and what is not and come to his own verdict of the overall experience.
This guide has been created to serve as a clean-cut visual aid for for getting all 50 secrets in the N64 campaign (49 on Easy and Normal). This campaign being a 1-1 copy of a shooter designed around the limitations of a fifth generation console, the maps are fairly small and detail-free. In turn, most of the secrets it contains are easy to spot. You are encouraged to play at least on Hard difficulty (for maximum monster population) and discover all the secrets on your own. Better refer to the guide only to find out what you are missing instead of following it step by step.
Of the two shots provided for the secrets, the first one covers the area it is to be found in while the second one shows a particular detail, which, in most cases, is the trigger itself. Additional tips are deliberately kept short to let the shots speak for themselves.

This unit consists of 4 levels that contain a total of 13 secrets.
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STROGG OUTPOST
1/4 - Stepping out, dive under the walkway to find supplies in advance.
2/4 - Utilize the nearby conveyor belt to reach the power-up in the open.
3/4 - Drop down to the lower floor and shoot the barrels by the ladder.
4/4 - Do as the game suggests to open up a compartment in the same room.
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CENTRAL COMPLEX
1/3 - At the beginning, go over the crates to get the suit of armor around the corner.
2/3 - Shoot the barrels and get the item hidden next to the pillar.
3/3 - Jump onto the blue-lit ledge and pass through the fake wall at the end.
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INTELLIGENCE CENTER
1/3 - Right past the first door, look up and shoot the button on the ceiling.
2/3 - Get on top of the crates and shoot the X textured part of the vent.
3/3 - Shoot the cracked part of the wall at the corner to find extra medkits.
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COMMUNICATIONS CENTER
1/3 - Right at the beginning, look up and shoot the button on the ceiling for extra medkits.
2/3 - Shoot the button found on the side of the stairs to open up a compartment nearby.
3/3 - Deactivate the pump, get the environment suit and dive into the slime pool.

This unit consists of 2 levels that contain a total of 8 secrets (7 on Easy and Normal).
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ORBITAL DEFENSE
1/4 - Return to the initial hall after disabling the gravity generator. Look for a button on the ceiling, shoot it and jump into the newly-revealed compartment above the nearby stairs.
2/4 - Following on from the previous secret, shoot the cracked part of the vent above.
3/4 - Trigger the liftoff and drop down to the bottom floor before the hatch closes back up.
4/4 - Jump on top of the large crate in the corner of the room and push the disguised button.
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DOCKING STATION
1/4 - Step onto the elevator to activate it, get back and shoot the button underneath.
2/4 - Push the disguised button on the wall to open up a hidden compartment nearby.
3/4 - Push the panel to the side of the third generator to reveal a power-up.
(This secret is not present on Easy and Normal difficulties.)
4/4 - On the way out, shoot the button behind the explosive crate that holds a suit of armor.

This unit consists of 2 levels that contain a total of 5 secrets.
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STROGG FREIGHTER
1/2 - Shoot the panel to the back of the central pillar to reveal a hidden weapon.
2/2 - Deactivate the security doors and shoot the button hidden above as you do so.
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CARGO BAY
1/3 - Get the suit of armor stashed at the end of the conveyor belt to the right as you pass by.
2/3 - Following on from the previous secret, take the ledge to the button around the corner.
3/3 - Following on from the previous secret, look for a button to shoot midway to the right.

This unit consists of 2 levels that contain a total of 2 secrets.
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ZAXITE MINES
1/1 - Shoot the ice covering the pool at the center of the cave to reach the visible supplies.
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STORAGE FACILITY
1/1 - Shoot the explosive crate to reach the weapon hidden in the middle of the stack.

This unit consists of 7 levels that contain a total of 19 secrets.
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ORGANIC STORAGE
1/2 - Past the slope leading out of the initial area, shoot the wall on the left and take the ladder.
2/2 - Stepping onto the upper walkway, turn around and jump across to the dead marine.
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PROCESSING CENTER
1/3 - At the beginning, shoot the ceiling button by the pillar to make a nearby item accessible.
2/3 - Before activating the mover, shoot the button behind the crates to open up a compartment.
3/3 - Once you are ambushed, get into closet in question and shoot the grate on the ceiling.
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GEOTHERMAL STATION
1/2 - Before going into the station, check the other side of the gate to find a power-up.
2/2 - Upon reaching the upper floor, turn around and make your way to the suit of armor across.
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DETENTION CENTER
1/3 - In the initial area, look up and shoot the cracked grate to be granted a power-up.
2/3 - Right past the upper walkway, look for a ceiling button to shoot around the corner.
3/3 - Dive into the water, turn around and swim through the opening to find a power-up.
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RESEARCH LAB
1/3 - After the elevator ride, shoot the cracked grate around the corner to get the suit of armor.
2/3 - Right after disabling the energy core, shoot the ceiling button found in the monster closet.
3/3 - Shoot the button found in the compartment to the right to reveal a hidden power-up.
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BIO-WASTE TREATMENT
1/3 - Dive into the water from the opening near the pipes to find a power-up underneath.
2/3 - Going through the upper floor, check by the pipes to the right to find a semi-hidden item.
3/3 - Look for a floor button between the pipes right after climbing the ladder and shoot it. After the next ladder, carefully take the newly-revealed steps that lead to the alcove in sight.
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ACCESS CONDUITS
1/3 - After the ambush, turn around and shoot the button above the stairs to reach the item.
2/3 - After another ambush, get in the monster closet in question and shoot the button within.
3/3 - Past the bridge, shoot the button in sight to reveal an item on the other side of the room.

This unit consists of 2 levels that contain a total of 3 secrets.
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DESCENT TO CORE
1/2 - After the initial ride, turn around and wait for another to utilize as a step to the power-up.
2/2 - Take the lift to its topmost point, turn around and jump onto the overlook to get the item.
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COMMAND CORE
1/1 - Step onto the elevator to activate it, get back and drop down into the opening.
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'Congratulations! We hope you enjoyed the game. As a token of our appreciation for playing, we offer you this hint. Drop down the console, type skill 2 and hit enter. Then type map q64/dm4 and hit enter once again for an additional challenge. The par time is 1:40. Have fun and enjoy!'
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Guides for the original, MPs 1/2, CotM, PSX and Zaero following the same format seen here are also available to accompany this one. Check them out if you are in for a completionist's run: