I was thinking of creating a thread about this subject, but since this one was started last year, may as well continue here. I've been thinking about what horror game to play this year for Halloween, and it's surprising how many choices there really are.
Really looking forward to Costume Quest, only a few more days. That game just seems to capture the essence of what it was like going out on a crisp fall evening, tons of leaves on the ground, with the smell of rubber and a (usually) sweaty mask on your face, walking through the neighborhood begging for sweets. So I'll definitely be playing that. Though it's obviously not horror, it's definitely Halloween.
Other choices in the more traditional horror genre:
Siren Blood Curse
Resident Evil REmake
Silent Hill 2
Fatal Frame 2 (wish I still owned the first game)
RE2
Eternal Darkness
Also, and this may sound odd, but a few years back when Mortal Kombat Deception came out, I got that for the Xbox and for some reason got a strong Halloween vibe from that game. I don't know what it is, maybe because it was released earlier that month. And even more odd sounding, the Tony Hawk games like THPS3 which released a few days before Halloween back in 2001 always reminds me of the holiday, and because of that I've had the urge to pop a copy into my PS2.