GMG SpinWord app for iPhone and iPad

Test your dictionary skills spelling words forwards or backwards to keep the wheel from filling. Random letters appear in the middle that must be used to spell words. A completed word scores points and clears those letters from the wheel. As you play and complete levels difficulty increases by requiring longer and longer words.
There are special tiles that can be used to modify the board, as well as toxic and frozen tiles that need to be dealt with.
Play 4 game modes with different goals. Normal mode to set your personal best high score. The Daily Dare allows you to compete online where everyone gets the same tile sequence for a given 24 hour-period. The 10-10 Test is a quick game that quickly increases in difficulty over 10 levels.
The Catalyst puzzle is 14 levels of chain reactions, each one completed by placing a single letter. All words a common, singular, and in clockwise order.
There are 8 achievements to unlock and plenty of spelling fun to be had.
The only thing tracked is your score for the Daily Challenge. No information is shared with 3rd parties.