Pretty much fun
The challenges start off really easy, but get harder and more challenging as you go. Youre shown a block of letters and have to make two (possibly more at higher levels) words from the letters. The letters for the words have to be adjacent. Yet only one of the words may have all its letters adjacent. It has no time limit that Ive found so far. You dont have to be tied to a game if you need to do something else.
Foldsjr about
Word Jungle: Spelling Puzzles, v3.1