This text is part of the Superphonics series of graded readers which use a phonic approach developed by reading expert Ruth Miskin. There are four levels in this series; Blue (the easiest), Green, Purple and Turquoise (the hardest). Each level is linked to one of the core Superphonics books. Blue storybooks practise the sounds taught in Supersonics Book 2. Hotdog! focuses on the following sounds: a as in cap, e as in bed, i as in tin, o as in nod and u as in gum.