https://play.google.com/store/apps/details?id=au.com.xandar.jumblee

Lexathon® is a free 9 letter word jumble puzzle game for Android mobile devices.

Previously known as Jumblee Words, it has now been rebranded as Lexathon®.

From a block of 9 letters, find as many words as possible of 4 or more letters that contain the central letter. There is always a 9 letter word to find among the scrambled letters.

But be warned: it's addictive, challenging and will definitely improve your vocabulary and mental alertness.