SFX-360 writes: "HALO ODST is completely different than any of the previous Halo games but somehow it's also the same, in a good way of course. ODST has dropped onto store shelves today and players who pick it up will find themselves taking on not just one role, but many actually. The main role of course puts you in the shoes of the new ODST trooper simply named "the rookie". Taking place at the same time as Halo 2 your ODST squad gets dropped into New Mombasa just in time for the covenant carrier ship to make is space jump and wipe out of most of the city with it. The blast separates you from your squad mates and you are forced to learn the ropes on your own.
New Mombasa plays out as a large open world environment and you are free to explore it as you wish. Along the way you will find that the city is occupied with covenant forces and as you explore it you will find clues as to what happened to your missing squad mates. Each time you do the game will then put in the role of that missing squad mate and you will play a mission as that person. These parts of the game take on a more linear level approach like the previous Halo games. Once you reach the end of the level the game puts back in the role of the rookie again, free to roam around the city..."