Just received my "Internet Button" from Particle. It's a Photon with a convenient shield which holds a ring of LEDs, four buttons and more.
This makes it a very natural fit for this first project, as it has all the hardware required without any assembly.
If you're able to follow the quickstart tutorial to make the Internet Button blink, you have all the skills required to complete this project. Simply:
1. Create a new App in the Web IDE and give it a name ("Simon" works).
2. In the Web IDE tab for "Libraries", add the "Internet Button" and "Simon" libraries to your application.
3. Copy&paste the few lines of code I provided.
4. Flash your Internet Button with the resulting application.
See it in action at https://youtu.be/I9h6PxNxiuQ