RE: OB is one of the best RE games in the series.
This game need to use some braines and intelligence. Unlike other RE games, this one has multiplayer mode in the online feature of course (more than 2 players in the game) and has 2 players in the offline mode (story mode) but actually, not 2 playable characters or in another name "cooperative mode" no..it's one player (and that's is you) and the other player is controlled by computer but can be useful and handy very like the human players.
The game tactic is ass follows: surviving amongst zombies in many areas. You can find variant weapons and objects that can be useful in most parts of the game. The characters, each one of them has different skills such as : one have the ability to compare things together and greating items, and one can use weapons so strongly at variance of other characters, one can pick locks with a handsome object. You can climp to many places to complete your tasks. To inform, levels are so hard to complete it in small time, so don't be suprised if you notice that you had spent 2 weeks or more trying to exceed the first level. Despite it's hardness, the game is very addictive and enjoyable.
The graphics: don't worry about the graphics it's the best, it's much like tekken 4, the characters and zombies exterior looks very perfect.