tetr-s

Written Python 3 with tkinter module. Your default Python distribution may not include this module, please consult the Internet.

On Ubuntu, this works (but you may want not to install packages system-wide):

sudo apt-get install python3-tk

Controls

ESC to pause, UP to rotate clockwise, Left Ctrl+UP to rotate CCW, Left Shift+UP to rotate by 180°, DOWN to speed up falling, LEFT/RIGHT to move.