didnt see any hats when i played it.
ended up playing all 5 games in a row, black mesa > halflife 2 > lost coast at about the point where theyd cut it > halflife 2 > episode 1 > episode 2.
that was fun, and it was wierd at the same time. talking to my sister berfore, i couldnt remember a single thing from the game, but as i was playing it, it all came flooding back even to the point of where all the hidden sections and easter eggs are.
getting the gnome all the way to white forest was a right 'ol pain, kept falling out the car and the chopper kept banging it off down cliffs. still he got there in the end. was quite useful for squishing all the grubs/larvae in the mines.
im imagining the hats are just as complicated and annoying. theyll be near the start, or just after the core explosion, anywhere else, theres no point having it in the game as an achievement.
itll be a year or more before i play it again though, so ill be no use as to where it is or even which one