Can someone explain to me how the Grotto map system works? After putting the game down for a few months I've been playing pretty regularly again and I thought as I would beat Grottos I would get higher level maps, but that hasn't been the case. Today I beat a level 38 map and got a level 24 map as a reward. Beat the level 24 and got a level 16 as a reward. All of these were done with a party all leveled in the low to mid 50's. Is it just random?