Sparky guides you through Script Springs. Standing in the way: NaN the Trickster — every mistake this lane teaches you to avoid. Variables, numbers, strings, operators, control flow — where your code first comes alive.
All 29 lessons below are free, need no signup, and each one opens as a comic issue with a live try-it sandbox, a task list that pays XP, and a narrator that reads it aloud. Progress is stored in your own browser — nothing is uploaded anywhere.