do hardened levels rewards reset after ascension and super ascension

ascension: no
super ascension: yes

thx!

An ideas on how we can achieve more 'play multi-levels'?

You can buy the powers.

You can unlock the multi level advancement in phase 4.

You can also get the powers as a reward for getting 1st or 2nd in CW, or for unlocking a new league on the ladders.

ML is a lot weaker than you might think, as you either need to combine it with SL (which is a big waste of an SL, and arguably the ML too) or you need to already have both target levels unlocked to start them at the same time.

There could be an argument made for using ML to run HEH and HTrisk once you have both open. However, there's a stronger argument to be made to just not play either of those levels at all as their AP/time is not good compared to the alternatives.

Once you can unlock the ML advancement, it won't be useful anymore. P4 makes everything easy and you become the bottleneck.