Snakeword app for iPhone and iPad
Snakeword is a puzzle game which provides the challenge of a crossword but with some distinct differences.
Each answer has a start and end square shown by the numbers on those squares. For the answer to be correct it has to reach the square with the next number.
Every time you place a letter which is a vowel (A,E,I,O,U) you must change direction by 90°. This is what causes the words to snake around.