Mixing together high intensity combat action with some tactical elements, players must work as a tight, special operative unit to progress through a built stage with enemies constantly engaging almost every step of the way. What's interesting is that these stages are both 2D side-scrolling, but have 3D cross sections that present a distinct visual appeal to the player when dealing with multiple enemies on screen. Enemies might be firing from far off on a stairwell or down a lengthy corridor, or right next to your character. Choosing how to position your character plays a big part in how well your survivability will be in these situations, given the multiple levels of enemy placement.