Advance Wars: Days of Ruin is a turn-based tactics video game for the Nintendo DS handheld game console. It is the fourth and latest installment in the Nintendo Wars series and was released in North America on January 21, 2008; in Europe on January 25, 2008; and in Australia on February 21, 2008. The release date for Japan has not yet been announced. The game is preceded by Advance Wars: Dual Strike, Advance Wars 2: Black Hole Rising, and Advance Wars, although this series is a sub-series of the Nintendo Wars set of games, which dates back to the Nintendo Entertainment System game Famicom Wars in 1988.
Advance Wars: Days of Ruin features a new storyline independent from the previous installments in the series, centering on the adventures of the Rubinelle 12th Battalion in a post-apocalyptic world. The Battalion is one of the surviving remnants of the military of Rubinelle, which had been locked in a century-long war with its rival, Lazuria, prior to a devastating global meteor shower. In the aftermath, the Battalion devotes itself to saving any other survivors of the disaster, despite the shattered nations renewing their war against each other and an uncurable disease ravaging both sides. Meanwhile, a mysterious faction pushes both sides deeper into conflict from behind the scenes, its dark motives kept hidden as it revels in the destruction.