As he deals or receives damage, he charges up his rage meter and, depending upon the level of charge, he can unleash these abilities, (which range from a simple attack boost, to an ultimate power that deals lethal damage to everything and everyone around him) using the D-pad. One of the other objectives of the Ninja is to collect 'rage stones' - special items that grant him new abilities. Last, but not least, there are also coins to gather in the various levels, which can be used to purchase bonus missions from the friendly, minor characters one meets in the game: some of these are highly challenging, all are highly enjoyable. In addition, there are sword upgrades that are obtained by slaying sufficient enemies these blades not only look distinct, but also handle a little differently in combat. Accummulating grades also enables the Ninja to earn belts, which are essential for unlocking later missions. The player's primary task in the game is to collect grades by completing various missions, which will lead him to ultimately defeat the nefarious O-dor (an alien villain who has invaded the world of I-Ninja with his army of sinister, robotic Ranx units), and more importantly, become a true ninja master. He also acquires and employs darts and shuriken to great effect, and, in some levels, can take control of rocket launchers and guide missiles around obstacles to destroy barriers, items or foes - a most gratifying experience.

These include using a chain to swing from metal rings over chasms, sprinting at an angle of ninety degrees from the ground, spinning his blade like a helicopter's to glide downwards, wall jumping, etc. The ninja not only runs, jumps and deals death with his sword, but also employs a number of special moves that befit an aspiring assassin. I-Ninja's riveting gameplay is its central feature. Indeed, it is no less than a pure embodiment of the essence of videogaming. A delightful and memorable action-platformer, I-Ninja ranks among the very best multi-platform games of its generation, thanks to its exceptional gameplay, excellent music and extraordinary protagonists. One of Argonaut Software's final titles was also one of its finest.

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