Tetris

This easy-to play, fun puzzle game will test your logic skills, but it could do with less ads. Even though the rounds can be fairly similar, Tetris can be an addictive app experience. Players will sometimes be asked to meet certain goals, such as reaching the highest possible score in two minutes, and as they progress, pieces fall faster, making their placement more challenging. The single-player game offers plenty of fun, but if kids want to see how they'd fare against other players, the Tetris Royale option can be a way to expand their game without parents having to worry they're going to be chatting with strangers. It costs a ticket to play, though, so kids may burn through the five they're given when they start using the app -- which would require buying more with real-world money.

The ads you see are a considerable drawback -- they appear fairly often, and some are long, which notably slows gameplay down. You can pay a fee to remove them for a month, but after that, you'll need to pay again to avoid seeing any. Parents may also not be too excited about the nightly primetime games, which offer a chance to win money. Even though they’re free to play, it adds a commercial element to the game that it really doesn't need. Kids are probably best off sticking to mainly playing the classic version of Tetris, which provides plenty of fun.