You can have some fun with Left 4 Dead on your own, but the content is too limited to make it worth purchasing exclusively for solo play. Rent it for a weekend, have some fun, and then return it before it begins to feel old. Left 4 Dead is one of those games like Madden NFL or Rock Band that is a lot more exciting and fun to play when played with friends. You'll come back to it time and again whenever you get a chance to play it with some friends, and even to play with random gamers online. After all, isn't that what Left 4 Dead is all about? Four strangers thrown together into a life or death situation who must work together to survive?