this is what i did

round 1: activate gaara's barrier and main's chakra wall for main and gaara just to stack some more shields

round 2 and 3: kurama naruto rasengan pointing tobirama on both rounds that'll activate minato's dodge wait untill konan attacks minato to use konan's mistery on minato

round 4: don't use any mystery just activate gaara's barrier again and try to NOT activate any combo untill hiruzen dies once he die use naruto's rasengan to stop his * death bringer skill

by round 5 you should be already in hell with all the edo tensei kages orochimaru fire and lightning main

use naruto rasengan on lightning main

use earth main chakra wall to get chakra once you get it inmediatly use konan's mistery on hashirama and gaara's big sand cone on orochimaru

after that everyone should be pretty much dead

this lvl for me was hell on earth (or game in this case XD)

but if everything goes well you should pass it

patience and big a deep breath is needed

if anythng goes wrong just start all over again

konan can dodge 2 standard attacks so you need to hope edo tobirama points his standard on konan to NOT activate edo hashi 30 hits chase

or you'll be pretty much f....cked

hope it helps