Select from Upper case, Lower case, and Numbers.
Drag the letters to their proper position in order.
There are also numbers, up to 26, one for each letter in the alphabet.
There is also audio that says the letter when touched, to assist children that cant read yet.
At any point, tapping the solve button will move the letters to their proper ordering, to assist in learning.
The start button will move the letters back to their starting position at the bottom of the screen.