It isn't even challenging, it's just the same thing every time. Each level takes like two seconds to complete, and there's an ad every two or three levels, so I spend like 5 seconds playing, then 5 seconds watching an ad waiting to skip it. It's also super aggravating when you complete a level and have to sit and wait several seconds to go to the next one, unless you click the "watch a video to double your rewards" button. Otherwise you have to wait like 5 seconds for a button that says "No thanks" pops up so you can go to the next level already. I know this is just a cash grab app, so complaining won't change anything, and they'll update it with more levels maybe 2 or 3 times before forgetting it ever existed and moving on to their next app, but I figure maybe I can warn others and ward them off from playing a boring and bad game with hundreds of fake/bot accounts rating it to get it a nearly perfect score.