I think the higher the remainder hp when u complete the trials, the more level you can sweep

Maybe getting to the end with X ninjas remaining = X amounts of sweep?

The highest lvl you can sweep up to is lvl 9,
10,11 and 12 cannot be swept
and if you don't clear all 12 levels, the next time you will only be allowed to sweep fewer lvls

what determines how many levels you can sweep.

I'm usually top 5-7 when it comes to survival clearance speed. Tend to lose no more than 4 ninjas in really really hard fights. Never have I been allowed to sweep more than the first 3 rounds. And yes I do clear all 12 stages and both Breakthroughs every single day.

oh, never see this function, im just a noob :Q

How the heck do you do that? I keep running up against teams that are higher level than me.

I play the Brazilian game, when I got to Lv 65, I was allowed to sweep up to the 9th one, as long as I kept winning all of them 12.
The thing is, you c*ways withdraw and start again if the battle isn't going so well.
Also, at lv 71 I can still not sweep any more than the 9th battle, so it may be the limit or maybe it unlocks on a higher level or something

hes probably one of the stronger people on is server, but eventualy your power will start to even out with other people as levels become harder to gain

how do you sweep in Survival Trail? I didnt see any sweep option

if you clear all 12 stages today, you can sweep tomorrow