Not taking into account last week, where Modern Warfare 2 had the biggest launch in entertainment history, this week has perhaps the most robust release lineup in recent memory. Good thing Modern Warfare 2 was so short… Three huge games are coming out this week, all of which are must buys. The New Super Mario Brothers Wii features classic Mario side scrolling action with up to four players. For those who prefer the more mature titles, Assassin’s Creed 2 brings stealth action in to Renaissance era Italy, on Xbox 360 and PlayStation 3. Both are guaranteed to be great games, but they lose out this week to a horde of zombies.

Left 4 Dead 2 is the latest release from Valve and has potential to be their biggest. Pre-orders are four times that of the original installment and Executives within Valve expect this to be the fastest selling game in the company’s history. This prediction comes with good reason too. Left 4 Dead, which has only been around for a year, has already established a booming community of team based zombie killers. The sequel is set to contain more special zombies, more zombie killing tools and five more campaigns. Plus, don’t forget the horde full of DLC is also expected to follow this already bustling game.

Stopping an invading Russian army has its appeal, but nothing is like mowing down an oncoming horde of the mindless undead. It’s probably a safe bet to say that there are no cooperative games that will be quite as fun, or as intense, as Left 4 Dead 2. This is definitely a must buy this Holiday season.