Contra 4

Contra 4 is a 2D action game for the Nintendo DS and the eleventh original installment in the Contra series. The game was released in North America on November 13, 2007. Contra 4 was produced by Konami Digital Entertainment in America and developed by WayForward Technologies, making it the first Contra game developed by them, as well as the first original Contra game for a portable platform since the 1991 Game Boy game Operation C. As the game's title indicates, Contra 4 was designed to be a direct sequel to the Contra games for the Nintendo Entertainment System and Super NES (Contra, Super C, and Contra III: The Alien Wars), with a gameplay model similar to those games, and was also in celebration of the 20th anniversary of the original Contra.

A Japanese version has been released on March 13, 2008 under the title of Contra: Dual Spirits (魂斗羅 デュアルスピリッツ?). No European or Australian version of the game has ever been released.