A great riddling app, but one needs to open up an account to get more word categories.
Bird is the word is a great riddling app about searching for words in a a jumbled mess of letters. The words which should be found, are symbolized by pictures - touching these will make the kids hear the words. These need to be found within a certain time. There are diverse categories of words to chose, only one is for free. The others can be unlocked when getting a Mingoville username and account.