./Tetris [-h] [--dark-mode] [--size SIZE [SIZE ...]] [--lang LANG][--difficulty DIFFICULTY]

* -h, --help               show this help message and exit
* --dark-mode              run game in dark mode
* --size SIZE [SIZE ...]   [width][height] game size, default 15 * 20
* --lang LANG              language, default 'en'
* --difficulty DIFFICULTY  'easy', 'hard', 'veryeasy', 'veryhard', 'invisivle', 'ex',  or 'normal'