Set on a ravaged world, Ninety-Nine Nights II invites the player to take on all comers in a series of spectacular battles – or join forces with their peers via the game's online options. Players can enjoy the story from five different perspectives – including humans, elves and goblins – and are pitted against wave after wave of adversaries in the ultimate 'last man standing' free-for-all. Each of the species is given a specific back-story which unfolds as the game progresses, while the various races also bring unique skills and abilities to the battle field.

At its heart, Ninety-Nine Nights II is a vast combat title, with hundreds of enemy creatures on screen simultaneously. As the camera picks over the action, the player can use a wealth of easily-effected combo attacks to carve a path through the enemy, and also use whatever skills and items are available. At the end of each skirmish, players will then face a 'Titanic Boss Battle' against the champion of their current adversary, with players forced to move quickly and locate the well hidden weak spots of a seemingly unstoppable behemoth.

Following the game's September release, there will be three download packs available. The first will be released at the end of September and offers new maps, called Aerial and Guard maps in online modes for just 320 MS Points for Gold membership members. A free download will follow in October, unlocking a new character for online use for Gold membership members as well, while an Equipment pack adding stronger weapons for all characters for use both on and offline will be released in November for just 40 MS Points, for both Gold and Silver membership members.

KONAMI has also confirmed a downloadable demo is also now available for free via Xbox Live® Marketplace.