Excellent App – Montessori Crosswords for Kids Review
As a special Ed teacher, I consider this to be a very useful App. While it doesn't implicitly teach phonic rules, it reduces frustration by altering the sounds of the vowel symbols to fit the vowel sounds used in each word. This would need to be explained to students who have learned to spell phonetically and might be confused by the changing vowel sounds. Learn by doing.
Review by Aussiesinger on
Montessori Crosswords for Kids.