Web Reference: Learn how to use the mouse wheel to scroll in scratch in under 30 seconds, with a little trick :) - Did you know about this? This tutorial shows how to detect mouse wheel scrolling in Scratch 1.4, 2.0 and 3.0. When the up or down arrow keys are inputted into the when () key pressed block, the block will also activate when the mouse is scrolled up or down, respective to the arrow key inputted. Jun 28, 2025 · So How Do I Detect Scrolling? Use this trick: Or better yet, just watch this variable: Then scroll your mouse wheel while the project is running. Boom. You’ll see it register. But Wait, What’s Actually Happening? Technically, this is a glitchy side-effect of how Scratch handles unexpected inputs.
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