I recommend this free game called Hidden Objects: Mystery Crimes [https://itunes.apple.com/us/app/hidden-objects-mystery-crimes/id674105088?mt=8]. It's free, but the dev, Lava Games, hits you often with the request to download their other games. The solution to this is simply to not install their other games.
Seriously, there are people complaining about the "hard sell" but it really isn't. There are 12 levels so far (I think) and only one of them, the bonus one that takes place in Rio, actually requires that you download, install, and play another title. I did it, and then deleted the other game. Like most free games there is a limited amount of "energy" you have to play, which works out to five attempts every five hours. And certain forensic tasks can take up to 9 hours (real time). But again, all you have to do is walk away, do something productive, or play a different game.
I highly recommend it. I paid 99 cents for Peggle, but the one game I always come back to is Mystery Crimes.