Load the firmware by holding down the BOOT button on the RP2040-Plus board while plugging the USB into your computer.
The RP2040-Plus will pretend to be a USB drive.  Drag and drop the appropiate firmware file to this drive.
There are two firmware files, one for a device with 4MB flash and the other for 16MB.

Game Notes:
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PESCII Robots.  Look in the directory "PETSCII Robots README" for more information.

Flappy Bird:  Any button except SELECT and START will make the bird jump in the air.

Pico Man:  Button A will make the game play faster, B will make it slower.