Took me 3 tries to do last map, figuring out how that map works is easy. You need a 30k team on upper slot (dont put 1st party here) leave empty mid one and put all other 4 parties to bottom left. 3 isnt enough because 1 party cant handle the enemies at the bottom right. And finally if your 1st party's power is higher than 40k then you should lower its speed a bit than other parties because they'll clear everything in its path and finish stage before you clear it. Note that all of your teams speed gap shouldnt be high. The rest is up to upper arrows.