Sarah Lonberg-Lew and I have been doing some amateur coding and we've created a project we're ready to share. Please check out our "Guess My Rule!" game at https://adultnumeracynetwork.org/resources/functiongame/index.html.
This is our first coding project and we hope it will be something you can use with students. Feedback wanted, but please be gentle! We're new at this!
This is such a fantastic tool, and I love the way you've re-imagined the "function machine" idea commonly found online. I hope you'll get to share this with NCTM and on sites like OER Commons. When you're rich and famous, we can say we knew you when...! ; )