Once you've gotten CircuitPython onto your Circuit Playground Bluefruit boards, it's time to add some libraries. You can follow this guide page for the basics of downloading and transferring libraries to the board.
Libraries for Quick Draw Duo
From the library bundle you downloaded in that guide page, transfer the following libraries onto the two CPB boards' /lib directories:
Libraries for Reaction Timer
From the library bundle you downloaded in that guide page, transfer the following libraries onto the CPB (or CPX) board's /lib directories:
During development, the Quick Draw Duo application was tested on CPBs using CircuitPython 5.0.0-beta.2 with libraries from the adafruit-circuitpython-bundle-5.x-mpy-20200107.zip bundle. It should work on subsequent versions, the latest version is recommended.
The Reaction Timer code was tested on a CPX using CircuitPython 4.1.2 and on a CPB using CircuitPython 5.0.0-beta.2. The libraries were from the adafruit-circuitpython-bundle-4.x-mpy-20200107.zip and adafruit-circuitpython-bundle-5.x-mpy-20200107.zip bundles, respectively. It should work on subsequent versions, the latest version is recommended.