If you're new to Ark: Ultimate Mobile Edition, or you don't know where to find RELIABLE information about difficulty, then this tips for you (i didnt know where to put this)

Just go to the wiki page for difficulty, don't trust people that say that the max level for dinos is 150, its 120 for normal creatures, 144 for tek creatures, and even higher for dinos in the snow cave, swamp cave, and the caverns of lost hope.

for example, if you want normal creatures to spawn at a max level of 30, try a difficulty setting of 0.143.

Oh and also fall damage SUCKS in this game.