Every letter of the alphabet has two shapes, and a child has to learn both. Big and Small Letters shows a capital and asks for its lower-case partner.
What your child is learning
Some pairs are easy because the small letter is a shrunken copy: C and c, O and o, S and s. Others look nothing alike: A and a, G and g, R and r, Q and q. Those simply have to be learned, and this game mixes both kinds.
Children usually meet capitals first, on signs and in their own name, yet most of what they read is in small letters. Linking the two is an important early reading step.
The tricky ones
The game deliberately includes look-alikes among the wrong answers. When the answer is b, your child will often see d, p and q beside it. These four are the same shape turned different ways, and almost every child muddles them for a while. Mixing them up at five or six is entirely normal.
Other close pairs appear together too: m and n, u and n, i and l.
How to help
Say the letter's name and its sound: "This is B. It says buh." Then look for the match.
For b and d, try the word "bed". Make two fists with thumbs up. The left hand looks like b, the right like d, and together they spell bed.
Trace the letters with a finger on the table. Movement helps memory.
Find the letters of your child's name first. Those are always the best known.
Taking it further
Go on a letter hunt in a book. Pick one letter and find every capital and small version on a page.
All twenty-six letters are used. For alphabet HTML5 games, the look-alike choices make this one more useful than most.