Party: Well here is where some random parties may struggle. To be successful you need Dende+Karma+Poko+Tank (either Ultima/Grand or SK /DW)+ slot for random player with ticket. Again reminder Im talking about speed party cuz thats what I only use (lul no place for Poko in crit party I cri).
Mobs floors: Same as above except 56-59. Those are robots floors. I hate this part cuz its not hard but takes soo much time. Strategy is simple: Tank gather robots (how many depends on how strong tank is), Dende stays close to him so that if tank looses aggro mobs wont scatter, and AoE dps jsut fires whatever he has (often its Turtle with Kames). Meanwhile Poko and Karma destroy Capsules and join rest of party to give 15 or 25 speed buff. When Poko and Karma are done with their job kill remaining robots.
55F Boss - IMO there is rapid increase in difficulty between 50F and 55F. You spawn in the middle of room that is similar to UD1. Whole party needs to go to stairs we are on in the screenshot. If you have pro tank (like we do) ex. Skedar you can stand like we did. If not its best if tank comes with boss up to the doors at the end of stairs and whole party stays close so that Karma and Dende can reach with their AoE and Supers wont scatter. Boss himself uses buff that increases his damage and stacks multiple burn debuffs. Dont worry about Supers just dps boss.
60F Boss - Here boss uses stun and sometimes bleed. Also boss buffs his movement speed and at the same time stacks movment speed debuff on party. Like before Supers spawn to help boss and sometimes attack pearson with 2nd highes agro. Just ignore them and dps boss.
65F Boss - If you are about to fail it will prob happen here. After Supers update this floor got little tricky. There are two ways to deal with it. First way is that your random (mostly it will be Turtle) aggros Supers and runs around the map with them in big circles while the rest dps boss. Second if your party strong enough just dps boss and tank uses AoE on both boss and Supers to keep them on him. Its good to know that Supers (those mice) have range stun and it can get pretty messy if Dende gets stunned. Also boss uses damage buff and 2 debuffs on tank. Both debbufs got to be removed from tank ASAP by Dende and Poko. One debuff lowers CON by 50% and the other lowers deffs by 50%. Easy to imagine if boss stacks both debuffs on tank he can 1 shot him.
70F Boss - First of all kill the eggs around you as soon as you spawn. Than you can proceed to killing boss (ignore wolfs but if one of them comes close kill him first than return to dps-ing boss). Its important that Karma uses anti-bleed buff on thos floor. Also remember that boss has AoE attack so keep your distance and dont come too close to debuff him cuz you might get 1 shot. Boss uses 20% LP drain debuff on tank so Poko and Dende need to remove it ASAP. You get 1 Alpha Circut and 5 Blue coins if you clear this stage.
75F Boss - This floor is similar to 25F but a little tricky. Before you attack boss get to platform in such a way that you aggro only one turret that surround boss. Make sure you all get to platform together before anybody attack boss cuz than Rockets are gonna appear. If you do this correctly proceed to dps boss. Try to kill him ASAP cuz he stacks dmg buff on himself.