Bugs: several words don't disappear -- any chance of having a "get it, then!" button?
e.g. car, box ... not complicated words.
Some of these disappear when you add an "s".
And what's with the flashing tiles that change from e.g. P to S? (just switched to O and S)
 "Utopian Mining"){kind=icon}
 "Ancient Jewels: the Mysteries of Persia"){kind=icon}
 "MAKING WORDS"){kind=icon}
 "Kaleidoscope Reef"){kind=icon}