The Blinky Grid kits use Charlieplexing to enable controlling 56 LEDs from only 8 microcontroller pins. This is great, until something goes wrong. It can be very difficult to figure out which LEDs are connected to which pin, so we created these handy images below. Each image has color-coded pins to indicate which chip pin is connected to which LED pins.
If you are building your Blinky kit and notice that some LEDs are messed up or not lighting up, take a look and see if the messed-up LEDs have any colors in common. If so, you might try re-soldering the corresponding pin on the microcontroller to see if that helps. We have diagnosed several different broken blinky grids this way, so it might work for you.