Rollii & Friends — a free STEM storybook for ages 3–7
Picture-book stories to read together — free, no sign-up
Every story stars the same four friends — Rollii, Giggle, Mossy and Bubbo — working out one problem together. Read it here on the screen, print it if you like, then try the same idea at home with a real marble run.
CoverChapter 2The Hurry-Up RampThe cloud ramp is tall and long, with a sharp bend near the end. Rollii wants the marble to go faster than ever — but can it still hold the corner?Coming soon
Meet the four friends
They are the four friends at the Marble Lab, each with one strength — coming up with ideas, designing, adjusting, and watching closely. Every chapter runs through all four steps.
Rollii
Yellow · Lightning
How to spot them
A bolt on top, a red-white-blue sports headband, orange boots.
In a nutshell
The one who always wants to be fastest.
Their job in the story
The idea-maker — raising the start, adding a jump, trying it again.
"I'm going to be the fastest today!"
Giggle
Red · Fire
How to spot them
Flame hair, a white sun hat, white boots.
In a nutshell
The one who loves designing the route.
Their job in the story
The designer — Giggle plans the bends and ramps, and is always thinking about the next exciting slope.
"The next stop is going to be even more exciting!"
Mossy
Green · Leaf
How to spot them
A leaf cap, round glasses, brown boots.
In a nutshell
The one who tidies up and explains.
Their job in the story
The fixer — lines the track up neatly, spots the too-tight bend and smooths it.
"Look at the board — a steeper slope makes the marble too fast to turn."
Bubbo
Blue · Water
How to spot them
Diving goggles, purple antennae, purple boots.
In a nutshell
The one who looks closest.
Their job in the story
The observer — goggles down before anyone else, and the one who asks exactly where the marble left the track.
"I saw it clearly — this time it held the bend, steady."
Look inside Chapter 1
Four pages from the book — free to read, no sign-up.
Chapter 1 · Read it nowThe Finish Line Is Gone!The marble stops just before the finish line. Four friends set out to work out why — changing one thing at a time.Read Chapter 1
