Excerpt: “You are a ninja. And like all ninjas, you have an unquenchable thirst for gold.” So says the manual for “N+”, Metanet Software's new side-scrolling platformer on the DS. Wait—isn't it leprechauns who have an unquenchable thirst for gold? Whatever, Metanet. I'm willing to play along. N+ is the sequel to 2004's “N”, a free internet Flash game by programmers Raigan Burns and Mare Sheppard.