A free app for Android, by Androyal.

This app is filled with a wide variety of challenges, which will make you think, “I can’t possibly solve these.” But you can! These brain teasers will sharpen your wit and test your brainpower. And you’ll have so much fun while doing it. You will be given the task of crossing a river. The characters you will need to transport are some cabbage, a goat, and a wolf. Don’t worry, it’s not as difficult as it sounds. You will be given the clues, so you just need to follow them. But the rules are not as easy as it seems. And if you get stuck, you can always ask for help.