I'm considering the Osmo Little Genius starter set for my just turned 4 year old. He's obsessed with putting shapes together to make pictures and otherwise hasn't shown much interest in screens up til this point, so I thought this might be up his street. However in the letters game, do they call the letters by their names or their phonics sound, IE would it say "bee" or "buh" for B? The trailer for it uses the letter name whereas I know teachers prefer them to learn the sound first.