Official BTD6 artwork

Ninja Discipline is the first upgrade on Path 1 for the Ninja Monkey. It costs $255 on Easy, $300 on Medium, $325 on Hard, and $360 on Impoppable.

In BTD5, this upgrade increases attack range and attack speed of a Ninja Monkey from one attack every 18 frames to one attack every 15 frames, giving it 20% more attack speed. After upgrading, the ninja turns white with a black bandana.

In BTD6, this upgrade increases attack speed by 66.7%, thereby increasing the attack speed for the shuriken attacks from every 0.7s to every 0.42s. Upgrading will add a white headband to the Ninja Monkey.

Upgrade PictureEdit

In BTD5, the upgrade picture is of a white scroll with illegible writing.

In BTD6, the upgrade picture is a fast-moving shuriken.


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