too many ads
I liked the logic puzzle resources aspect of Castle Raid!, but there were way too many interrupting interstitial and onscreen ads. So I bought the 'no ads' option. I still got ads, even though the game would tell me I had the no ads option. So I got a refund from Apple. There are many 'free' games, with interesting playing mechanics, that inundate you with so many ads, ruining the gaming experience, and taking you out of the moment. Your time isn't worth it.