Colm Field 
Kyan Green Battles the Multiverse [PDF ebook] 

It’s time to race across the multiverse and save not just one world, but all of them! Kyan Green is getting the hang of racing through the multiverse in the Infinite Race. If he’s driving a bubble-butt car through a giant’s cereal bowl or riding on the back of a cosmic critter, he can’t be beaten. But when the mysterious infinity racer Spider Ace charges Kyan and his friends with a mission that has them hurtling from one universe to the next, it couldn’t be more dangerous. Together the gang must race from world to world, seeking out the multiverse doubles of Kyan’s devious landlord Mr Stringer and facing off in battles that could tip the balance between good and evil. Lose a single battle, and every single parallel dimension could be in jeopardy