The Ninja perk in Call of Duty: Black Ops for the PS3, Xbox 360, Wii, and PC is a nice perk for you stealthy players out there that like to get those silent kills since it allows you to move siltely. Coupled with the Ghost perk and a Suppressor attachment, you can be nearly undetectable in a lot of matches.
Move silently
The Ninja Pro perk upgrade gives you the added benefit of making no noises at all, like when you jump down off of a ledge. You also hear enemies much louder than you previously could.
Don’t forget that you need to purchase the Ninja Pro perk upgrade after it’s unlocked for 3,000 COD points.
Here is the list of Ninja Pro perk challenges, and some tips to help you complete them:
Back Stabs — Get 5 Backstabber Medals
This one should come fairly quickly. It helps to equip Ghost, that way you can sneak up behind the enemy much easier. If you see an enemy that doesn’t see you, follow them for a second instead of shooting them right away and stab them in the back.
Plants — Plant the bomb 10 times in Demolition, Sabotage, or Search & Destroy
This one can take a little bit of time. It helps to have some friends help with this one, so you can be the designated bomb runner while your friends watch your back. If you don’t have friends to help you out, then equip Ghost and a Suppressor attachment to help you sneak around better, and be patient.
Silenced Kills — Get 150 kills using the Suppressor attachment
Self explanatory. Just equip the Suppressor attachment and mow fools down with your gun.