NES version (retitled Super C for its North American version) has three new stages and a new final boss, but lacks the upgradable weapons from the arcade game. Unlimited Software created DOS and Amiga conversions for the North American market, based on the arcade original. Operation C (Game Boy) (1991) Operation C is the first Contra game made specifically for a portable platform. Featuring gameplay similar to the NES version of Super C, Operation C also first introduced the "homing gun" power-up. Contra III: The Alien Wars (SNES, Game Boy, Game Boy Advance) (1992) The series' first entry for a 16-bit game console, Contra III allows the player's character to climb into walls or railings and carry two weapons that can be switched back and forth, as well as smart bombs that kill all on-screen enemies. Many of the stages and bosses made use of the system's Mode 7 graphic effects, including a bike riding stage that ends in a midair battle with the main character riding missiles. The player is now required to rotate their character in the top-view stages to move along with the scenery. Two heavily modified portable ports were produced; a port for the original Game Boy, simply titled Contra: The Alien Wars; and a later Game Boy Advance port, titled Contra Advance: The Alien Wars EX, which replaced the top view stages with levels from Contra: Hard Corps. Contra Force (NES) (1992) Contra Force combines the run and gun style of the Contra series with a power-up system similar to Gradius. The game is notable for being the first Contra to feature selectable characters with their unique weapon configurations. Contra Force lacks the alien invaders and futuristic environment of previous installments, as the game centers around an elite task force fighting human terrorists in a present-day setting. The game was actually planned as an unrelated game in Japan titled Arc Hound, but it was never officially released there, nor in Europe. Contra: Hard Corps (Mega Drive/Genesis) (1994) The first Contra game for a Sega platform. Hard Corps also contains selectable characters with unique weapons and abilities and introduces an in-game storyline with branching paths that alter the ending. Contra: Legacy of War (PlayStation, Sega Saturn) (1996) The first of two Contra titles developed by Appaloosa Interactive, as well as the first attempt to convert the Contra gameplay to 3D and the first game in the