I guess I'll try this again. I've also restricted myself to all films I haven't seen before again.

6 Sequels
Diary of the Dead, A Nightmare on Elm Street 3, 28 Weeks Later, Halloween II, Inferno, Poltergeist II

6 Countries
USA, Italy, Australia, France, UK, Germany, Czech Republic

6 Decades
30s, 50s, 60s, 70s, 80s, 90s, 00s & 10s

6 Pre-1970 Films
Titicut Follies, The Old Dark House, Repulsion, Planet of the Vampires, Diabolique, The Cremator, The Curse of Frankenstein

6 Films from Carpenter, Raimi, Whale, Browning, Craven or Holland
Child's Play, The People Under the Stairs, The Old Dark House, The Serpent and the Rainbow, The Gift, Fright Night

3 Cannibal Movies
Delicatessen, Raw, Parents

1 Hammer Film
Curse of Frankenstien

1 Romero Dead Movie
Diary of the Dead

1 Oversight
Diabolique

2 Tobe Hooper Films
The Funhouse, Invaders from Mars