From my experience with this mode, you will want to conserve your health and gather as many tokens you can as a safety net. While this mode may not appear difficult to some, it will present a challenge to others. At the end of each stage you will face enhanced zombies grouped with smaller ones; while the small zombies are not an issue, the enhanced zombies (Zombride, Blister Sister, etc..) can really cause some damage. The good news is you can block all of the Zombrides kicks, when she teleports in-front of you.
The two moves that I found the most helpful were:
+
+
and
+
+
+
+
. The same two moves at which were extremely helpful in story mode. Be sure to be at a distance when using these two moves to avoid taking damage and keeping your enemies at a distance so they cannot damage you.
Be sure to always be on the move and evade with
and remember to counter the projectile enemies with
to gain an edge in Ninja Time. Some of the most annoying enemies such as the Blister Sisters and Zombrides appear quite frequently between stages 2-4.