The arena got changed to level based instead of random. So you need to beat a certain amount of enemys to get the next one, once you beat the final enemy ones the keeper will give you a relic. This relic increases your attack by 50% and you luxury by 30%.

My website link: http://bioraingame.com

Gx.games link: https://gx.games/games/fjeseg/balls-of-the-duck/