Young Readers will enjoy these simple and engaging stories written with their reading level in mind. Featuring Mercer Mayer's charming illustrations and favorite Little Critter characters, children will want to open these books again and again. To ensure reading success, the First Readers were based on McGraw-Hill's respected educational SRA Open Court Reading Program.Young Readers will enjoy these simple and engaging stories written with their reading level in mind. Featuring Mercer Mayer's charming illustrations and favorite Little Critter characters, children will want to open these books again and again. To ensure reading success, the First Readers were based on McGraw-Hill's respected educational SRA Open Court Reading Program.