developer ,difficulty 100, seriously .....??? Are you playing your game?How am I supposed to do it all in a minute when there are too many enemies!!!!!? Make a balance! It's impossible to get through! If I get 5 pushers all the time .Bots are useless and constantly dying! Fix it all!!! It is impossible to live to 100 .even with top cards! There are too many enemies and push!!! (translation.ru)
I mean seeing as it's supposed to be the hardest challenge and with the characters themselves saying they've never really had people even get there before, I think it's difficulty level is accurate. It took me about an hour of upgrading and experimenting with different cards to get to 100 difficulty. I'll give you a tip, when your other dolls die you can pick up their cards and gain all of its effects. The challenges themselves are relatively easy if you're able to do that
Did you even read my comment? I even said it took me about an hour of upgrading cards and looking at abilities. I'll spell it out for you, you can just gather up a bunch of cards that each have the ability to stop all but a few of the gigabytes from attacking you. If you can't deal with only 3 gigabytes you wont beat the challenges anyway so there's no point in you trying. I will say you do have to button mash towards the end but it's nothing that bad considering it's already a strat that makes up for the user's own lack of skill
Max difficulty is hard, but doable. I recorded a video showing how I did it, if it's helpful: https://youtu.be/SlKfJSxlMPo?si=CD8mFC1Zx1WNmMdn