I bought the no-ad upgrade, and there's still ads (less, yes, but not none). So don't waste your money on that. The ads take more time than the game. An ad for loot multipliers (I don't think it's optional either), an ad to upgrade stats, an ad to get a temp upgrade for a level (that you likely need to win the level). The game is kinda fun in a brain-dead kill-time kinda way, but you spend more time watching ads than playing. Even tho I paid, uninstalling.