Todd Frogley and the Upside Down World

His video games are Todd Frogley’s life until he discovers the hidden switch on his uncle’s antique kaleidoscope. Now he’s having adventures that put his video games to shame.
Twelve-year-old Todd is flung from one colliding reality to another; from nearly losing his head in King Arthur’s Camelot, to walking the plank on a pirate ship, to a world where intelligent dinosaurs want to remove his brain for study. And he used to think life was boring.
In each book, Todd experiences three alternate realities before regaining the safety of his own world. Each chapter ends with a cliffhanger scene and each book ends with him unable to resist using the colliderscope one more time and finding himself in even more trouble.