-Perhaps the most significant change of all is the fact that Ryu is actually responsive in Razor’s Edge. Ryu’s recovery has been shortened greatly, so players can easily cancel into a dodge or block as the situation demands.
-Enemies have been improved. They are more aggressive, and some have access to new moves. The basic terrorist grunts and alchemists are the most obvious examples.
-Combat has been redesigned to have a more technical feel. Enemies have more stagger animations (including wall damage/stuns). Both playable characters now have a universal grab (the Guillotine throw).
-Charge attacks are extremely fast. Ninja Gaiden 3 introduced a charge mechanic, whereby holding down the heavy attack resulted in a powerful combo extension. The length of time needed to charge this attack has been reduced dramatically.
-There are six weapons available to Ryu in Razor’s Edge right from the get-go. Ryu now has access to the claws, scythe, dual katanas, staff, and an as-of-yet unrevealed weapon, on top of the standard katana.
-Karma has been redesigned to function as both the point/ranking system, as well as currency.
-Collectible items have been reintroduced. The Golden Scarabs from the original Ninja Gaiden, and Crystal Skulls from Ninja Gaiden 2 are strewn about each stage, and can be collected for an instant Karma bonus.
-Players can use this Karma currency to purchase upgrades for weapons and magic (Ninpo) as well as unique combat abilities and even in-game costumes.
-The new “Cicada Surge” teleportation ability has been polished greatly since its reveal back during E3. It is an incredibly handy way to get out of overwhelming situations.
-A new ability, called “Four Rings” has been introduced. It is a 360º shuriken attack that stuns enemies surrounding Ryu, and can be tacked on to combos on-the-fly, much like ordinary shuriken attacks.
-Ultimate Techniques can be used even when Ryu/Ayane’s weapons aren’t glowing red, simply by holding down and charging a heavy attack (much like in Ninja Gaiden 2). Ultimate Techniques have two charge levels once again.
-Ninpo is still earned through combat. However, you can keep your Ninpo charge between encounters now, allowing you to cast magic or save it as you see fit.
-Bosses have life gauges now. You can see their health on the bottom of the screen.
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