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This is book number 5 in the Secret Coders series.
From graphic novel superstar (and former computer programming teacher) and New York Times bestselling author Gene Luen Yang, Secret Coders: Potions & Parameters is the fifth volume in a wildly entertaining series that combines logic puzzles and basic coding instruction with a page-turning mystery plot!
Dr. One-Zero won't stop until the whole town—no, the whole world—embraces the "true happiness” found in his poisonous potion, Green Pop. And now that he has the Turtle of Light, he’s virtually unstoppable.
There's one weapon that can defeat him: another Turtle of Light. Unfortunately, they can only be found in another dimension! To open a portal to this new world, Hopper, Eni, and Josh's coding skills will be put to the test.
Praise for the Secret Coders series:
"Gene Luen Yang’s talent is prodigious, his enthusiasm contagious . . . Even this confirmed technophobe was ready to learn coding." —Katherine Applegate, author of Crenshaw and The One and Only Ivan
"Gene Yang brings computer coding to life." —Entertainment Weekly
"By the end of Secret Coders, readers will learn the three major ways that code is organized, right alongside Hopper and Eni, not as something dry or rote, but something transformative." —Wired
"While the coding instruction's as top-notch as ever, in this installment it's interpersonal dynamics and characters that, satisfyingly, take center stage."—Kirkus