This plot seems to be exactly like the one in the danish movie "Mørkeleg" from 1996.
The plot in that one:
"Four high school friends meet up in an abandoned house to play 'Backstabbed', a game of murder with headphones and plastic weapons. Meanwhile, a serial killer is leaving a trail of blood on his way to the house, and soon the game of murder becomes much more than make-believe"
And that also sucked!
How about the writers making their own movie, or at least label it with a "re-make" sticker!
In my opinion, the movie gets even worse when you figure out that you have seen it all before.
And what the hell is up with you guys and the "hot chicks" A movie has never been better because of "hot chicks" Rent a porno flick, at least they have better plots!