To use Crickit, we recommend CircuitPython. Python is an easy programming language to use, programming is fast, and its easy to read.
If you're using Circuit Playground Express (CPX), Please install this special 'seesaw' version of the CPX firmware. Plug the USB cable into the CPX, double click the reset button until you see CPLAYBOOT drive, then drag the UF2 file onto the disk drive:
What's nice about this special version is that the adafruit_crickit, adafruit_seesaw and adafruit_motor library is built in, which saves you tons of space and makes it really fast to get started