Ninja



Ninja is a Tier 3 perk appearing in Call of Duty: Modern Warfare 2. The perk stops users from appearing on Heartbeat Sensor attachments, and is unlocked at Rank 29.

The Pro version of this perk is unlocked after players kill 50 players in "close-quarters" while using the perk, and it reduces the movement noise volume (footsteps, mantling and climbing) by 75%, effectively replacing Dead Silence. The actual distance that constitutes "close-quarters" needed for the challenge is unknown (50 melee kills will unlock the Pro version), but it is approximately the range at which the Tier 3 Perk Scrambler completely Scrambles the radar of enemies - Scrambler Pro is unlocked similarly by making "close-quarters" kills. It also may be the distance at which a Heartbeat Sensor can detect players.

Ninja is most useful in games such as Sabotage and Search and Destroy as players with Heartbeat Sensors often wait by the objectives, but it is often useless in other game types due to the rarity use of Heartbeat Sensors. Earlier in Modern Warfare 2's multiplayer there were more Heartbeat Sensors used as players were trying out attachments, so the Ninja perk was more useful.

Ninja Pro is more often used in all custom classes by players that use gaming headsets, which help them to hear other player's movements without theirs disrupting them. This has also stopped some players from Prestiging as they find it difficult to play the game without their footsteps being silent.

rTrivia

 * Even with Ninja Pro, players will still make a loud cracking sound when falling from an elevated height, just like its predecessor Dead Silence. Players with Ninja Pro will also make noise if they move through branches or bushes.
 * Ninja Pro actually reduces footstep sounds to a fourth of their original volume, but this is still extremely quiet and will almost never be heard.
 * SitRep Pro has no effect on Ninja Pro. [1] Players using SitRep Pro will not be able to hear Ninja Pro users more easily than players who are not using SitRep Pro.
 * Friendlies using Ninja do not appear on Heartbeat Sensors, proof of which can be seen here.
 * Perhaps not with Ninja itself, but it is widely contested that Ninja Pro does not block the Heartbeat Sensor, even when not sprinting or stationary. This is assumed to be a killcam glitch, but players report that enemies' movements before killing them suggest that they knew where they were. Let it be known that this has been tested in a private match environment and both Ninja and Ninja Pro seem to function as intended. That is not to say it may have never been an issue, but if it was it was most likely fixed. Finally, it has not been tested in every game-mode, nor in a public game, although it is unclear if that is relevant. See discussion for details.