HexagonApp was my first ever published iOS app. I built it during my Christmas break in 2012. It grew out a java game I had made for my 4 yr old niece. I very reasonably called it the circle game, but the 2 yr old decided it was the hexagon game. She does the voice and it took my burgeoning audio engineering skills to slice parallelogram together. I don't know why 4 yr. olds would have trouble with such a small simple word.
While the app was aimed at those first learning their shapes and colors, I have found even adults with masters degrees in nursing education and JD's learn that cyan is indeed a color! Sorry, my parents, said nurse and lawyer, didn't know the color cyan. A Nurse! Cyanosis ANYONE!