Ninja Gaiden II: The Dark Sword of Chaos

Ninja Gaiden II features the same beat 'em up gameplay as the original title, with some extra additions. In this episode, Ryu has the power to climb any wall by pressing Up or Down on the control pad. In the previous game, the player could only "stick" to a wall by jumping towards it, but was unable to scale in any direction without jumping to an opposite wall or by using a climbing technique that involved jumping away from the wall and immediately grasping it again. The most innovative new feature was the ability to create "split clones" (also referred to as "Phantom Doubles" or "Shadow Clones") where by picking up an item, an orange shadow version of Ryu would constantly follow him, repeating his previous actions (moving or attacking) in a delayed cycle. These clones were immune to damage, and enemies and projectiles would pass through them. If the player stopped moving, the clones would be frozen, regardless of position, being in mid-air or between enemies or objects. In the still phase, the clones performed the projectile or slash attacks of the player. Up to two split clones could be used at any given time. In the adjacent screenshot, the player has jumped to the left of the enemy, while his spirit clone remains in mid-air in Ryu's previous position. Frozen in place, the clone copies the attacks of the player.