Extra Challenge Quest (Done)

I'd say it's worth it in a generalized sense (3SQ = 1 ticket), but if it's a close match, I'd probably just do the whole thing again vs. burning a quartz on 5AP.

If you have a delay team, it's surprisingly not impossible to slow ball the whole thing (I did it in 105 turns when my Golden Standard became Memelin with Mash). I ended up using my command seals because getting my uber team back on round 6 (when Mash and Merlins went down finally) basically gave me an easy win for the final leap.

I would say don't bother unless you're in wave 6 or 7 by the time you go down.

Maybe it's just me, but if it is only costing 5AP, I would rather do it again. Yes, it can be frustrating if you barely lost the fight, but for me, the SQ are too precious and every little bit counts if you are F2P.
Like, sure, SQ doesn't guarantee you a SSR, but I would still prefer to save them enough for gacha.

Why don't redo it ? It's just need 5 AP, the battle can last pretty long but you'll know your own mistakes and clear the challenge Quest smoother.

To me, gacha odds are so terrible that I expect nothing out of a single roll, so spending 1/3 of a nothing roll isn't a big deal to me. It's a bit of a closer call when it's only 5AP at risk, but still 5 AP is worth about 125k QP (250k QP starting tomorrow with the 1/2 AP QP dailies).

If I got to the final wave, I'd definitely spend the 1 SQ if I needed to.

No especially if you f2p never use SQ exept for gacha, just redo the fight since it only cost 5 ap

3 tickets = 9 quartz, so if you are sure that you will win the fight using less than 9 quartz then go ahead and use them.