NAME: 4 Pics, 1 Word

WHAT IT IS: A game in which you have to find the common bond among four photos.

HOW MUCH: Free, with in-app purchases from 99 cents to $19.99

COMPATIBLE WITH: iPhone, iPad, and iPod touch, requires iOS 9.0 or later; Android 2.2 or later

WHAT’S GOOD: Games don’t get much simpler or more addictive than this one. Click Play and on your screen will pop a quartet of images such as an email icon, an answering machine, a bottle floating in the ocean and a woman checking her cellphone. Below them will appear some empty boxes and below that a grid of letters. Type in the letters you think fit the answer (in this case “Message”) and collect virtual coins that can then be used toward acquiring hints on more difficult puzzles. Along the way, there are challenges, such as solving four puzzles in which the answer is a color. The more you play, the harder each level gets. There’s also a multiplayer mode if you want to challenge friends on Facebook.

WHAT’S NOT: The one thing that’s not pretty as a picture is the annoying ads that pop up after every couple of levels. For just $1.99, the ad-free version is well worth the money.

BOTTOM LINE: 4 pictures + 1 word = countless hours of enjoyment.