Here is a list of my g-man sightings. feel free to add any I've missed:
1 - on a moniter screen in kleiners lab in chapter 2
2 - on the tv the vortigon is watching in the red carrige guarding the entrance to the old rail route in chapter 3 (be quick to catch this one)
3 - standing outside the old red barn as you arrive, chapter 4
4 - flickering on and off on a giant moniter attached to a building part way allong route canal, chapter 4
5 - standing on a walkway over the canal as you pass underneath, chapter 4
6 - walking away from the station along the railway outside the dock at the end of chapter 6
7 - look through the binoculars to little odessa on the highway, chapter 7
8 - on a moniter in nova prospect, chapter 9
9 - on a tv in a room full of junk just after you loose dog in city 17, chapeter 11 (be quick to spot this one)
10 - flickering on the giant moniter that the citizens pull down, chapter 11 (very hard to spot)
e-mail me for more precise descriptions if you need it.
This "G Man" dude appears far more (at least that I've noticed) in HL2 than he did in the original one. I havent' seen him in person in HL2, but I recall from HL1 he always appeared in inaccessible locations and if you used NOCLIP to get to him and tried to shoot him, sparks flew off him like if you try to shoot at the wall. Also, it's MonitOr :)
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There is another sighting:
when you shoot down the heli drive with the hoover through the gate up to the house with the ammo. then you have to go around the house to open the dam. Just when you go right around the building you can spot the g-man standing where the two ladders are (one of the ladder is moveable) and walking away from you.
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One that no one ever seems to notice, when Dr. Kleiner opens the secret room in his lab by straightening the picture, take a look at the picture and you will see the G-Man stood with the scientists.
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When you are coming out of Ravenholme,and into the train tracks,kill some combine then run over to a destroyed train,crouch and look through a crack,you'll see the Gman walking away with...get this he is walking with a combine soldier
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I just realized, no one considers the flickering image of Alyx to be a G-Man sighting. The one in the chapter "We Don't go to Ravenholm", at the very end of the chapter. Where after getting the Pulse Rifle and killing some soldiers. When contacting Alyx, her transmission flickers G-Man's image. Look close at when her face sort of divides into two. One looks like she is wearing a tie and her face is a little elongated. I think it's G-Man
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When I saw it ,I kinda freaked out because I wasn't aware that the G man could be spot through the game and I saw him on a level where there is nobody except Gordon,Alix and a Vort... thing .I think its in Part 1 or 2 i don't remember it was weeks ago but its when you just got out of the cave with Alix and the alien and you got to go alone and the alien have a sniper and cover you,later you have to push car from a side of a bridge to the other side to incline to bridge to make a jump.Well when you first arrive at this area before everything I just explained,zoom on the bridge and you will see the G -Man walking .I know its not really clear but its the best I can remember.
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Another sighting: In one of the opening screens of the game (where it says New Game, Load Game, etc.), the one that's set in the ruins of City 17 where the Striders were, in the building across the street from the viewer the G-Man appears in one of the windows for a few moments.
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