ByteClub has created a fantastic game based on jumbled words called Scramboni.  This multiplayer game gives you a word that's all jumbled up and your job is to figure out the word, taps the letters to spell it and then submit.  There's a timer and you get more points for being first to submit the right answer.  Also, you'll see certain letters are red - this indicates they're the first/last letter of the word.

Personally, I am a huge fan of Jumbles so I absolutely love Scramboni.  But what makes it truly great is the multiplayer aspect and the fact that you can test your skills against 10+ people at the same time.  Very cool game.