12 1 20 The Key to the Universe Poskitt, Kjartan Additional Author mixed material 9781407107110 London Scholastic 2009 9781407107110.jpg.jpg Guaranteed to Mash Your Mind Poskitt, Kjartan Additional Author mixed material 9781407105871 London Scholastic 2008 9781407105871.jpg.jpg Guaranteed to Bend Your Brain Poskitt, Kjartan Additional Author mixed material 9781407105888 London Scholastic 2008 9781407105888.jpg.jpg Easy Questions Evil Answer Poskitt, Kjartan Additional Author mixed material 9781407114514 London Scholastic 2010 9781407114514.jpg.jpg Do You Feel Lucky? Poskitt, Kjartan Additional Author mixed material 9781407107127 London Scholastic 2010 9781407107127.jpg.jpg Desperate Measures Poskitt, Kjartan Additional Author mixed material 9781407105864 London Scholastic 2008 9781407105864.jpg.jpg Awesome Arithmetricks Poskitt, Kjartan Additional Author mixed material 9781407105857 London Scholastic 2008 9781407105857.jpg.jpg The Phantom X Poskitt, Kjartan Additional Author mixed material 9781407107134 London Scholastic 2009 9781407107134.jpg.jpg Savage Shape Poskitt, Kjartan Additional Author mixed material 9781407107103 London Scholastic 2022 9781407107103.jpg.jpg The Perfect Sausage Poskitt, Kjartan Additional Author mixed material 9781407107165 London Scholastic 2009 9781407107165.jpg.jpg Poskitt, Kjartan Additional Author mixed material 9781407123998 London Scholastic 2011 9781407123998.jpg.jpg Poskitt, Kjartan Additional Author mixed material 9780590114066 New York Scholastic 1999 9780590114066.jpg.jpg