I have preordered this game so i have been playing the demo for a few days now. this game is unbeleivably intuitive. the "director style" gaming works very well. if you dont know what that is yet, google it. i even found out a way in the demo to try out being the infected. ( I.E the boss zombies: hunter. smoker. boomer. tank) they were all incredibly fun and i have high hopes for the versus mode that will come out with the game. The game can be played single player but im relatively sure it is a thousand times more fun playing with 3 real people. If they leave, other people can join. If everyone dies, it reloads. if one person dies, they will eventually spawn in a closet in like 4 minutes or so. The only way to save them is to find them and let them out of a closet. The demo is so short, but thanks to the director style gaming i have been able to play it probably like 15 or so times and still not got sick of it. This game is going to be game of the freaking year and i can wait for it to come out.