N+ is the console and handheld version of the game originally made for systems powering Adobe Flash, N, which was developed by Metanet Software. N+ for Xbox Live Arcade was developed by Slick Entertainment and published by Metanet Software. Unique versions of the game were also ported separately to the PlayStation Portable and Nintendo DS by developers SilverBirch Studios and Atari. Metanet Software licensed their N IP for this deal, provided single player level design for both versions, and consulted on the project.
The Xbox Live Arcade version was released on February 20, 2008 and three expansion packs were released later that year on July 23, September 10, and October 15. The handheld versions were released on August 26, 2008.