its okie never played the game so no idea how true to story it is but the actual film is pretty good. Zoogy there is being mysterious about your films and just redicuoulsy hard!
Trust me, it's not that hard. Once you find out what it is, you'll either go "meh, never seen it" (in which case, I guess it is hard, but for you, not for the general populace) or "<facepalm> duh! How could I have missed it"...
well, apart from the V being Blue, the bullet time effect being over used and cheesy, the acting being just as much plus the story being butchered, it wasn't that bad an action film...
There is a historical conflict between two otherwise similar groups due to where they live. However in a exciting moment near the end of the film the leader of the opposing faction comes to help our main character who is the leader of the other faction.
It should also be remembered that the jungle is massive.