Ninja Gaiden 2 -
In the first game, you could not scale the wall or non-ladder surface but in this game you can scale the wall up and down. Slash the red orbs to get powerups, lives, and ninja power. Some contain scrolls that increase your maximum ninja power as you start with 40 max by default.
This first red orb contains the Fire Dragon Balls but they are only used usually to attack enemies below you at a 45 degree angle.