The first part of the series, in which you will get acquainted with the classic cooperative from Valve. You will be tested not only by zombie monsters, but also by adaptive artificial intelligence, which will change the conditions of passage depending on your success. Left 4 Dead will offer an impressive range of modern weapons that you can experience while playing online with your friends. The game still looks good, and considering its well-thought-out co-op, you should check it out.