You can toggle one LED immediately and watch it reflected in the live video stream above. Your next chance is based on the number of participants. There is a slight delay in the live stream which adds to the challenge.
Select an LED to toggle.
This project was inspired by Reddit's April 1 art project Place (about). I decided to make a more tangible version; this one uses The Matrix and a Particle Photon to toggle real life LEDs in my kitchen.
While this is no longer live, you can read about the project here, and click around the simulated page.