In this version, all four playable characters are robots (CX-1, CX-2, CX-3, and CX-4) in the 'Probotector' squad and the human antagonists are replaced with humanoid aliens. Like previous games in the series, the European localization changes numerous elements of the game to fit with a 'Probotector' theme. Members of the Hard Corps (including human soldiers Ray Poward and Sheena Etranzi, mutant cyborg Brad Fang, and small robot Browny) are sent to take care of the robot threat, while dealing with another threat looming in the distance. At the start of the game, a major city's security system is hacked into, causing a group of unmanned robots to cause havoc. With the Alien Wars ended, a new elite team of commandos was established to restore order (the 'Unified Military Special Mobile Task Force K-X', or 'Hard Corps'). The story takes place in far-future 2641, five years after the events of Contra III: The Alien Wars. The Japanese version received some changes to ease the difficulty (including a lifebar system and infinite continues). As the 'Hard Corps' in a title is a pun on the word 'hardcore', the game is known for its hard difficulty. The sixth game in the Contra series (and the first for a Sega console), Hard Corps builds on its predecessors by having four unique playable characters (each with their own weaponry and attributes, similar to Contra Force), a four-weapon inventory system, and a branching story system with six unique game endings and 11 total stages. Contra: Hard Corps (known as Japan as Contra: The Hard Corps and in Europe as Probotector) is a 2D sci-fi side-scrolling run-'n'-gun game developed and published by Konami for the Sega Genesis in North America (on August 8, 1994), Japan (on September 15, 1994), and Europe (on October 14, 1994).

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