The Shield GAMEx3 is a Tinusaur shield for connecting to a MAX7219 driven display with 8×8 LED matrix.

UPDATE 2022: The MAX7219LED8x8 library, now renamed to MAX7219tiny has now a new home at tinusaur.com/libraries/max7219tiny/. Check also this MAX7219 & ATtiny85 tutorial to learn how the library works.