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They're not impossible I've found, but you have to play them twice (as they have quick refresh times for used characters) and you need a lot of characters at roughly the same level (so I've got most of mine at around lvl 50). I found if you raise even 1 character too high, it ups the difficulty across the board and makes most of your other characters kinda obsolete.
You also need enough characters at roughly equivalent level to do at least 4-6 teams.
That said, some of them are horrendous challenges anyway (looking at you Leatherhead)
And epic duplicates are a pain in the arse. But at least you can cash in the extra covers for tcoins now. Not much consolation, but still.
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