In the next weeks we will be doing a new Arduino workshop at MADE Barcelona makerspace:
While preparing all the material Xavi discoverered that Dan Royer from imakerobots has done some Tetris for the 8x8LED matrix: https://github.com/MarginallyClever/ArduinoStarterKit/tree/master/LED8x8tetris
Unfortunately, the code is incomplete and he was not answering us, so I finally had to write some lines myself. I removed joystick interface and changed it for UART interface. It works quite well with CoolTermWin software.