ok just did the Mori Mori gold mission... is just a gold farming map. One boss, lv 70 that yield 7000 gold when defeated and way more than 28k of gold posible in the map (my units don't even got to the center and still got me 28k gold)

Cost 100 stamina and 2 flower gems for 3 starts (very easy xD), also you get 200 exp (very nice for a last mission before lv up)