5x5 RGB Matrix Breakout and arduino

Hi the 5x5 RGB Matrix Breakout (PIM435) is described as being compatable with Arduino.
Now a bit more detail would be very handy.
The Matrix uses the IS31FL3731 driver chip and there is an Adafruit Arduino library for this chip (the only one).
However all the Adafruit products that use this library are single colour and are either 15x7 or 9x16. Does the IS31FL3731 chip know how many LEDs are connected up and does it know that those LEDs are rgb? Anyone got any ideas?

I’m also having problems with 5x5 on Arduino.
Have you got it to work yet ?