Found out you can put two level one animals side by side and merge a higher level into both of them then combine them to double levels, crashed the game with a level 1300 squirrel.
it actually aint even that complicated, dont need to be two level 1 beasts neither does the singular one need to be higher level.
jsut have a pile of cards (with the same animal) on top of one another (easiest way jsut buy ton of rabbit eggs, they will land on top of each other naturally. or put the eggs on top of each other before auto clicker cracks them).
from said pile, take card, drop it, take card, drop it.risne and repeat until you are either satisfied, there is only a card left in the pile or game crashes, like in my case.
cause basically the level of the card you drop is added to ALLcards on the place where you drop it.
so you sacrify a card from the pile to have all the other cards in the pile double in level basically.
got to a big pile of level 10000 cards thatbefore game crashed.not sure if it crashed because the levels went 5 digits.or cause there were like 30 cards in the pile, so game had to do tons of calculations and stuff to modify the level for each card each time