1, 2, and 7.
Dual Matrix, in my opinion, it's really a different idea than Hunger Games; don't let the whole "Contestants isolated killing each other" theme fool you, the backstory and idea of IoP, IMO, are quite different. While I have never read Suzanne Collin's Hunger Games, from what I've heard, I understand that a totaltarian government is putting their citizens into gladiator-esque "games", to frighten their citizens into submission (Probably wrong about this), much like Koushun Takami's Battle Royale (An excellent novel). Now, Island of Pain is about an isolated, seemingly unescapable island, operated by a slaving-based faction known as The Shepherd of Flesh, which are depositing their less-controlable slaves on a deadly island, hoping to get rid of them, and, in the meantime, creating entertainment for themselves.
There are certian similarites, that it is obvious, but the idea and themes in Island of Pain, as I see them, are quite unique.