AngstromCTF2019: Scratch It Out

The Challenge

Scratch It Out Misc 60

An oddly yellow cat handed me this message - what could it mean?

Author: innoviox

link: https://files.actf.co/397a7663cfc657bea92b8038eb2a27804ac75ba56b74e56572e57f00414fd43f/project.json

The Solution

The linked file is a JSON document which appears to describe a scratch source document: project.json

Scratch has an online interpreter the project can be loaded into:

The graphical source looks like this:

Running the code reveals the flag in the animation area: