USJ - Halloween Horror Night 2015

Hi guys, I am planning to go USJ in October from morning and stay for the 'Halloween Horror Night'.

My question is: Do I have to purchase both
1) 1-Day Studio Pass (7200 Yen) &
2) Halloween Twilight Pass (5800 Yen) ?

Or I can also enjoy the horror night with just the 1-Day Studio Pass?

I believe the Twilight Passes are just for entry after 3pm (hence the cheaper rate); I used one when I went last December (I think it was Christmas-themed then). I doubt you have to purchase both - they wouldn't make everyone leave at 3 to buy another ticket, or be able to monitor that people with the 1-day Pass are leaving at the correct time!

Hi sq, thanks for the response! It makes sense :)

How about express passes? If I get the Express Pass 5 for the day rides, can I use them on the Horror Night attractions as well? Or is there a separate express pass for the Horror night attractions?

Not sure about that, but the Express Passes only work for certain rides (check the website for which rides on which Passes). So I doubt they will work for the Haloween attractions. Do they have special Haloween rides? Seems silly to set them up for so short a time and I don't know where they'd find the space...
Express Passes sell out fast so make sure you're there when the park opens - people start lining up way before and they usually open early as a result.

Hi,
Just wondering when is this Halloween Horror Night? Is there somewhere I can find the information?
Thx

I cant understand Japanese well. Can someone translate this? Thank you

http://s.usj.co.jp/halloween2015/HHN/ticket/

It runs from September thru November.
http://www.usj.co.jp/ticket/expresspass/attraction/hhn2015-epass4.html

Sept 11th thru Nov 8th it runs Fri, Sat, Sun, Mon, National Holiday
October it runs every night.