Best way to Farm Coins?

get a pet with all the pet loot skills available in cs, go to 2nd drill hall, stay at the top platform. afk. come back to all the boxes you looted. open them. get coins. profit.

edit: forgot to mention go to the ch where the grinders of your world trains.

Oh, did they fix the problem with not seeing other people's drops? Or is the pet able to get them all in the ~15 seconds that they are visible?