Flember: The Crystal Caves by Jamie Smart

Boy-inventor DEV and his best friend, BOJA, have found a secret map! So now they're on a mission to find more of the magical energy known as FLEMBER!But first they have to travel through the scary WILDENING . . . Survive in a LIFELESS town . . . And harness the power of Boja's FIERY FARTS!
Binding: Paperback / softback