Clear code area, add "on start' block, add "set all pixels to" block and set value to off (black), add "on button A click" block, duplicate "set all pixels to" block and move it into "on button A click" block and set value to red, duplicate "on button A click" block and change button A value to button B, change value of "set all pixels to" block to blue, make sure your Circuit Playground is in "Boot Loader" mode and download your code to it.

Clear code area, add "forever" block, add " if true then else" block and change true value to "light level" grater than or equal to 150, add "set volume" block and change value to 50, add "ring tone at Middle C" block and change value to 262 plus "light level" times 10, add "set volume" block and set value to 0, make sure your Circuit Playground is in "Boot Loader" mode and download your code to it.

Clear code area, add an "on start" block, add a "forever" block, look at defined variables in the "VARIABLES" section, drag out a "set strip to create strip" from the "NEOPIXEL" section under the "LIGHT" section, add the "set strip to create strip" block to the "on start block and click on the "create strip" plus icon twice leave the the "A1 set value for the "strip" variable and add the pixels value after counting the number of LEDs in your LED strip, look in the "VARIABLES" section again and see what has changed, add the "strip show animation for ms" block from the "NEOPIXEL" section under the "LIGHT" section to the "forever" block, make sure your Circuit Playground is in "Boot Loader" mode and download your code to it.

Visit the Adafruit infrared overview page for more detailed information, clear code area, add "on button A click" block, add "infrared send number" block, duplicate "on button A click" block, add "on infrared received num" block, add "if true then else" block, add "if true then" block, add "set all pixels to" block, duplicate "set all pixels to" block, add "LOGIC" and variable blocks as needed, adjust values as needed, make sure your Circuit Playground is in "Boot Loader" mode and download your code, install the code on two Circuit Playground boards for this exercise.